Dropping MPG
 

Hi all, after purchasing the '04 GC I posted about a few weeks back, I
was initially thrilled with a combined fuel economy of 22 MPG !

However now that the temperature is starting to drop here in the
frozen north, I am somewhat distressed with the current 14 MPG.

Nothing has changed, my driving habits, routes and distances are the
same, the only change has been the outside temperature.

I am thinking that I may have a sensor going a bit flakey.
Anyone have any thoughts ?


BTW 4.0L, 4 speed auto, 3.55 rear

Kevin

Re: Dropping MPG
 

How are you computing your MPG?
<kevin.dooks@ns.sympatico.ca> wrote in message
news:454ji2tcaip4mjt1hsnoiur0dsk448fp58@4ax.com...
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

How are you computing your MPG?
<kevin.dooks@ns.sympatico.ca> wrote in message
news:454ji2tcaip4mjt1hsnoiur0dsk448fp58@4ax.com...
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

How are you computing your MPG?
<kevin.dooks@ns.sympatico.ca> wrote in message
news:454ji2tcaip4mjt1hsnoiur0dsk448fp58@4ax.com...
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

Are you using the same flavor of gas? Might the fuel blend have changed?

If you were using real gas and switched to some kind of alcohol blend
that's going to drop your mileage.

Jeff DeWitt

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

Are you using the same flavor of gas? Might the fuel blend have changed?

If you were using real gas and switched to some kind of alcohol blend
that's going to drop your mileage.

Jeff DeWitt

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

Are you using the same flavor of gas? Might the fuel blend have changed?

If you were using real gas and switched to some kind of alcohol blend
that's going to drop your mileage.

Jeff DeWitt

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

With the 4 liter in a WJ you should be averaging overall between 18 and 20
mpg if you are a conservative driver.

Are you figuring your mileage with a pencil and paper or the EVIC?


<kevin.dooks@ns.sympatico.ca> wrote in message
news:454ji2tcaip4mjt1hsnoiur0dsk448fp58@4ax.com...
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

With the 4 liter in a WJ you should be averaging overall between 18 and 20
mpg if you are a conservative driver.

Are you figuring your mileage with a pencil and paper or the EVIC?


<kevin.dooks@ns.sympatico.ca> wrote in message
news:454ji2tcaip4mjt1hsnoiur0dsk448fp58@4ax.com...
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

With the 4 liter in a WJ you should be averaging overall between 18 and 20
mpg if you are a conservative driver.

Are you figuring your mileage with a pencil and paper or the EVIC?


<kevin.dooks@ns.sympatico.ca> wrote in message
news:454ji2tcaip4mjt1hsnoiur0dsk448fp58@4ax.com...
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

I believe that the gas blend is changed in the winter for cold climates. I
guess it could be possible that the winter blends are arriving already.
Might be worth an ask at the gas station, but they may not know unless you
talk to someone at a higher level than cashier.

Chris

"Jeffrey DeWitt" <JeffDeWitt@nc.rr.com> wrote in message
news:y7hWg.11998$fy.1334@tornado.southeast.rr.com. ..
> Are you using the same flavor of gas? Might the fuel blend have changed?
>
> If you were using real gas and switched to some kind of alcohol blend
> that's going to drop your mileage.
>
> Jeff DeWitt
>
> kevin.dooks@ns.sympatico.ca wrote:
>> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
>> was initially thrilled with a combined fuel economy of 22 MPG !
>>
>> However now that the temperature is starting to drop here in the
>> frozen north, I am somewhat distressed with the current 14 MPG.
>>
>> Nothing has changed, my driving habits, routes and distances are the
>> same, the only change has been the outside temperature.
>>
>> I am thinking that I may have a sensor going a bit flakey.
>> Anyone have any thoughts ?
>>
>>
>> BTW 4.0L, 4 speed auto, 3.55 rear
>>
>> Kevin

Re: Dropping MPG
 

I believe that the gas blend is changed in the winter for cold climates. I
guess it could be possible that the winter blends are arriving already.
Might be worth an ask at the gas station, but they may not know unless you
talk to someone at a higher level than cashier.

Chris

"Jeffrey DeWitt" <JeffDeWitt@nc.rr.com> wrote in message
news:y7hWg.11998$fy.1334@tornado.southeast.rr.com. ..
> Are you using the same flavor of gas? Might the fuel blend have changed?
>
> If you were using real gas and switched to some kind of alcohol blend
> that's going to drop your mileage.
>
> Jeff DeWitt
>
> kevin.dooks@ns.sympatico.ca wrote:
>> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
>> was initially thrilled with a combined fuel economy of 22 MPG !
>>
>> However now that the temperature is starting to drop here in the
>> frozen north, I am somewhat distressed with the current 14 MPG.
>>
>> Nothing has changed, my driving habits, routes and distances are the
>> same, the only change has been the outside temperature.
>>
>> I am thinking that I may have a sensor going a bit flakey.
>> Anyone have any thoughts ?
>>
>>
>> BTW 4.0L, 4 speed auto, 3.55 rear
>>
>> Kevin

Re: Dropping MPG
 

I believe that the gas blend is changed in the winter for cold climates. I
guess it could be possible that the winter blends are arriving already.
Might be worth an ask at the gas station, but they may not know unless you
talk to someone at a higher level than cashier.

Chris

"Jeffrey DeWitt" <JeffDeWitt@nc.rr.com> wrote in message
news:y7hWg.11998$fy.1334@tornado.southeast.rr.com. ..
> Are you using the same flavor of gas? Might the fuel blend have changed?
>
> If you were using real gas and switched to some kind of alcohol blend
> that's going to drop your mileage.
>
> Jeff DeWitt
>
> kevin.dooks@ns.sympatico.ca wrote:
>> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
>> was initially thrilled with a combined fuel economy of 22 MPG !
>>
>> However now that the temperature is starting to drop here in the
>> frozen north, I am somewhat distressed with the current 14 MPG.
>>
>> Nothing has changed, my driving habits, routes and distances are the
>> same, the only change has been the outside temperature.
>>
>> I am thinking that I may have a sensor going a bit flakey.
>> Anyone have any thoughts ?
>>
>>
>> BTW 4.0L, 4 speed auto, 3.55 rear
>>
>> Kevin

Re: Dropping MPG
 

Other comments on measuring techniques and alky gas are good for some of
the change but if it seems to be outside temp sensitive, I'd check the
thermostat and engine temp. If the thermostat does not allow engine temp
to get over the computer minimum (around 140 degress depending on the
sensor and engine/year), the computer keeps it in open loop (and very
rich) mode. You temp guage should be reading around 200F or 210F within
3 to 5 minutes of a cold start and low sppeds at say 40F outside.

I've had similar issues with other vehicles at this time of year or
whenever the morning temps are in the 20F to 40F range.

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

Other comments on measuring techniques and alky gas are good for some of
the change but if it seems to be outside temp sensitive, I'd check the
thermostat and engine temp. If the thermostat does not allow engine temp
to get over the computer minimum (around 140 degress depending on the
sensor and engine/year), the computer keeps it in open loop (and very
rich) mode. You temp guage should be reading around 200F or 210F within
3 to 5 minutes of a cold start and low sppeds at say 40F outside.

I've had similar issues with other vehicles at this time of year or
whenever the morning temps are in the 20F to 40F range.

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

Other comments on measuring techniques and alky gas are good for some of
the change but if it seems to be outside temp sensitive, I'd check the
thermostat and engine temp. If the thermostat does not allow engine temp
to get over the computer minimum (around 140 degress depending on the
sensor and engine/year), the computer keeps it in open loop (and very
rich) mode. You temp guage should be reading around 200F or 210F within
3 to 5 minutes of a cold start and low sppeds at say 40F outside.

I've had similar issues with other vehicles at this time of year or
whenever the morning temps are in the 20F to 40F range.

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?

O2 sensor can do this, but it's more likely in warmer weahter.
Does your area switch to "winter blends"?

FWIW, this is what I use to track milage and other stuff.

instructions not included. :)
http://www.revbeergoggles.com/gasminder/

--
DougW

Re: Dropping MPG
 

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?

O2 sensor can do this, but it's more likely in warmer weahter.
Does your area switch to "winter blends"?

FWIW, this is what I use to track milage and other stuff.

instructions not included. :)
http://www.revbeergoggles.com/gasminder/

--
DougW

Re: Dropping MPG
 

kevin.dooks@ns.sympatico.ca wrote:
> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?

O2 sensor can do this, but it's more likely in warmer weahter.
Does your area switch to "winter blends"?

FWIW, this is what I use to track milage and other stuff.

instructions not included. :)
http://www.revbeergoggles.com/gasminder/

--
DougW

Re: Dropping MPG
 

Hi Doug,
Do you still keep a detail log book of your fuel stops and expense?
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

DougW wrote:
>
> O2 sensor can do this, but it's more likely in warmer weahter.
> Does your area switch to "winter blends"?
>
> FWIW, this is what I use to track milage and other stuff.
>
> instructions not included. :)
> http://www.revbeergoggles.com/gasminder/
>
> --
> DougW

Re: Dropping MPG
 

Hi Doug,
Do you still keep a detail log book of your fuel stops and expense?
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

DougW wrote:
>
> O2 sensor can do this, but it's more likely in warmer weahter.
> Does your area switch to "winter blends"?
>
> FWIW, this is what I use to track milage and other stuff.
>
> instructions not included. :)
> http://www.revbeergoggles.com/gasminder/
>
> --
> DougW

Re: Dropping MPG
 

Hi Doug,
Do you still keep a detail log book of your fuel stops and expense?
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

DougW wrote:
>
> O2 sensor can do this, but it's more likely in warmer weahter.
> Does your area switch to "winter blends"?
>
> FWIW, this is what I use to track milage and other stuff.
>
> instructions not included. :)
> http://www.revbeergoggles.com/gasminder/
>
> --
> DougW

Re: Dropping MPG
 

I get that kind of mileage drop when I have to use an alcohol mix in the
gas.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Jeffrey DeWitt wrote:
>
> Are you using the same flavor of gas? Might the fuel blend have changed?
>
> If you were using real gas and switched to some kind of alcohol blend
> that's going to drop your mileage.
>
> Jeff DeWitt
>
> kevin.dooks@ns.sympatico.ca wrote:
> > Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> > was initially thrilled with a combined fuel economy of 22 MPG !
> >
> > However now that the temperature is starting to drop here in the
> > frozen north, I am somewhat distressed with the current 14 MPG.
> >
> > Nothing has changed, my driving habits, routes and distances are the
> > same, the only change has been the outside temperature.
> >
> > I am thinking that I may have a sensor going a bit flakey.
> > Anyone have any thoughts ?
> >
> >
> > BTW 4.0L, 4 speed auto, 3.55 rear
> >
> > Kevin

Re: Dropping MPG
 

I get that kind of mileage drop when I have to use an alcohol mix in the
gas.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Jeffrey DeWitt wrote:
>
> Are you using the same flavor of gas? Might the fuel blend have changed?
>
> If you were using real gas and switched to some kind of alcohol blend
> that's going to drop your mileage.
>
> Jeff DeWitt
>
> kevin.dooks@ns.sympatico.ca wrote:
> > Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> > was initially thrilled with a combined fuel economy of 22 MPG !
> >
> > However now that the temperature is starting to drop here in the
> > frozen north, I am somewhat distressed with the current 14 MPG.
> >
> > Nothing has changed, my driving habits, routes and distances are the
> > same, the only change has been the outside temperature.
> >
> > I am thinking that I may have a sensor going a bit flakey.
> > Anyone have any thoughts ?
> >
> >
> > BTW 4.0L, 4 speed auto, 3.55 rear
> >
> > Kevin

Re: Dropping MPG
 

I get that kind of mileage drop when I have to use an alcohol mix in the
gas.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Jeffrey DeWitt wrote:
>
> Are you using the same flavor of gas? Might the fuel blend have changed?
>
> If you were using real gas and switched to some kind of alcohol blend
> that's going to drop your mileage.
>
> Jeff DeWitt
>
> kevin.dooks@ns.sympatico.ca wrote:
> > Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> > was initially thrilled with a combined fuel economy of 22 MPG !
> >
> > However now that the temperature is starting to drop here in the
> > frozen north, I am somewhat distressed with the current 14 MPG.
> >
> > Nothing has changed, my driving habits, routes and distances are the
> > same, the only change has been the outside temperature.
> >
> > I am thinking that I may have a sensor going a bit flakey.
> > Anyone have any thoughts ?
> >
> >
> > BTW 4.0L, 4 speed auto, 3.55 rear
> >
> > Kevin

Re: Dropping MPG
 

L.W.(Bill) ------ III wrote:
> Hi Doug,
> Do you still keep a detail log book of your fuel stops and
> expense? God Bless America, Bill O|||||||O

Not a real detailed log, unless I'm driving on buisness. I use
excel to keep track of milage and maintenance.


> DougW wrote:
>>
>> O2 sensor can do this, but it's more likely in warmer weahter.
>> Does your area switch to "winter blends"?
>>
>> FWIW, this is what I use to track milage and other stuff.
>>
>> instructions not included. :)
>> http://www.revbeergoggles.com/gasminder/
>>
>> --
>> DougW

Re: Dropping MPG
 

L.W.(Bill) ------ III wrote:
> Hi Doug,
> Do you still keep a detail log book of your fuel stops and
> expense? God Bless America, Bill O|||||||O

Not a real detailed log, unless I'm driving on buisness. I use
excel to keep track of milage and maintenance.


> DougW wrote:
>>
>> O2 sensor can do this, but it's more likely in warmer weahter.
>> Does your area switch to "winter blends"?
>>
>> FWIW, this is what I use to track milage and other stuff.
>>
>> instructions not included. :)
>> http://www.revbeergoggles.com/gasminder/
>>
>> --
>> DougW

Re: Dropping MPG
 

L.W.(Bill) ------ III wrote:
> Hi Doug,
> Do you still keep a detail log book of your fuel stops and
> expense? God Bless America, Bill O|||||||O

Not a real detailed log, unless I'm driving on buisness. I use
excel to keep track of milage and maintenance.


> DougW wrote:
>>
>> O2 sensor can do this, but it's more likely in warmer weahter.
>> Does your area switch to "winter blends"?
>>
>> FWIW, this is what I use to track milage and other stuff.
>>
>> instructions not included. :)
>> http://www.revbeergoggles.com/gasminder/
>>
>> --
>> DougW

Re: Dropping MPG
 

On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:

>Hi all, after purchasing the '04 GC I posted about a few weeks back, I
>was initially thrilled with a combined fuel economy of 22 MPG !
>
>However now that the temperature is starting to drop here in the
>frozen north, I am somewhat distressed with the current 14 MPG.
>
>Nothing has changed, my driving habits, routes and distances are the
>same, the only change has been the outside temperature.
>
>I am thinking that I may have a sensor going a bit flakey.
>Anyone have any thoughts ?
>
>
>BTW 4.0L, 4 speed auto, 3.55 rear
>
>Kevin


Thanks for the input folks, here is some more info. Yes my area does
switch to a 'winter' blend but not for another month or so. No I do
not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
and grade of fuel are the same. I calculate my MPG manually and
compare that figure with the on-board smarts, the difference is less
than 0.1 MPG so that doesn't account for an 8 MPG drop .

The engine temp when hot is 140 C or about 195 F, I wouldn't think
that this is too cold but I could be wrong. It is at temp after 4 or 5
minutes.

The only other thing I did was to change the plugs, the NGKs I took
out appeared to be running OKish ( #6 seemed a bit rich) but the gap
was over .060 ! . I have checked all electrical plugs and connectors
just in case I accidentally disconnected something but all were OK.



Kevin

Re: Dropping MPG
 

On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:

>Hi all, after purchasing the '04 GC I posted about a few weeks back, I
>was initially thrilled with a combined fuel economy of 22 MPG !
>
>However now that the temperature is starting to drop here in the
>frozen north, I am somewhat distressed with the current 14 MPG.
>
>Nothing has changed, my driving habits, routes and distances are the
>same, the only change has been the outside temperature.
>
>I am thinking that I may have a sensor going a bit flakey.
>Anyone have any thoughts ?
>
>
>BTW 4.0L, 4 speed auto, 3.55 rear
>
>Kevin


Thanks for the input folks, here is some more info. Yes my area does
switch to a 'winter' blend but not for another month or so. No I do
not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
and grade of fuel are the same. I calculate my MPG manually and
compare that figure with the on-board smarts, the difference is less
than 0.1 MPG so that doesn't account for an 8 MPG drop .

The engine temp when hot is 140 C or about 195 F, I wouldn't think
that this is too cold but I could be wrong. It is at temp after 4 or 5
minutes.

The only other thing I did was to change the plugs, the NGKs I took
out appeared to be running OKish ( #6 seemed a bit rich) but the gap
was over .060 ! . I have checked all electrical plugs and connectors
just in case I accidentally disconnected something but all were OK.



Kevin

Re: Dropping MPG
 

On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:

>Hi all, after purchasing the '04 GC I posted about a few weeks back, I
>was initially thrilled with a combined fuel economy of 22 MPG !
>
>However now that the temperature is starting to drop here in the
>frozen north, I am somewhat distressed with the current 14 MPG.
>
>Nothing has changed, my driving habits, routes and distances are the
>same, the only change has been the outside temperature.
>
>I am thinking that I may have a sensor going a bit flakey.
>Anyone have any thoughts ?
>
>
>BTW 4.0L, 4 speed auto, 3.55 rear
>
>Kevin


Thanks for the input folks, here is some more info. Yes my area does
switch to a 'winter' blend but not for another month or so. No I do
not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
and grade of fuel are the same. I calculate my MPG manually and
compare that figure with the on-board smarts, the difference is less
than 0.1 MPG so that doesn't account for an 8 MPG drop .

The engine temp when hot is 140 C or about 195 F, I wouldn't think
that this is too cold but I could be wrong. It is at temp after 4 or 5
minutes.

The only other thing I did was to change the plugs, the NGKs I took
out appeared to be running OKish ( #6 seemed a bit rich) but the gap
was over .060 ! . I have checked all electrical plugs and connectors
just in case I accidentally disconnected something but all were OK.



Kevin

Re: Dropping MPG
 

K-tron wrote:
>
> On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:
>
> >Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> >was initially thrilled with a combined fuel economy of 22 MPG !
> >
> >However now that the temperature is starting to drop here in the
> >frozen north, I am somewhat distressed with the current 14 MPG.
> >
> >Nothing has changed, my driving habits, routes and distances are the
> >same, the only change has been the outside temperature.
> >
> >I am thinking that I may have a sensor going a bit flakey.
> >Anyone have any thoughts ?
> >
> >
> >BTW 4.0L, 4 speed auto, 3.55 rear
> >
> >Kevin
>
> Thanks for the input folks, here is some more info. Yes my area does
> switch to a 'winter' blend but not for another month or so. No I do
> not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
> and grade of fuel are the same. I calculate my MPG manually and
> compare that figure with the on-board smarts, the difference is less
> than 0.1 MPG so that doesn't account for an 8 MPG drop .
>
> The engine temp when hot is 140 C or about 195 F, I wouldn't think
> that this is too cold but I could be wrong. It is at temp after 4 or 5
> minutes.
>
> The only other thing I did was to change the plugs, the NGKs I took
> out appeared to be running OKish ( #6 seemed a bit rich) but the gap
> was over .060 ! . I have checked all electrical plugs and connectors
> just in case I accidentally disconnected something but all were OK.
>
> Kevin

What kind of plugs did you put back in? Some Jeep engines won't run on
bosch plugs....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Dropping MPG
 

K-tron wrote:
>
> On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:
>
> >Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> >was initially thrilled with a combined fuel economy of 22 MPG !
> >
> >However now that the temperature is starting to drop here in the
> >frozen north, I am somewhat distressed with the current 14 MPG.
> >
> >Nothing has changed, my driving habits, routes and distances are the
> >same, the only change has been the outside temperature.
> >
> >I am thinking that I may have a sensor going a bit flakey.
> >Anyone have any thoughts ?
> >
> >
> >BTW 4.0L, 4 speed auto, 3.55 rear
> >
> >Kevin
>
> Thanks for the input folks, here is some more info. Yes my area does
> switch to a 'winter' blend but not for another month or so. No I do
> not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
> and grade of fuel are the same. I calculate my MPG manually and
> compare that figure with the on-board smarts, the difference is less
> than 0.1 MPG so that doesn't account for an 8 MPG drop .
>
> The engine temp when hot is 140 C or about 195 F, I wouldn't think
> that this is too cold but I could be wrong. It is at temp after 4 or 5
> minutes.
>
> The only other thing I did was to change the plugs, the NGKs I took
> out appeared to be running OKish ( #6 seemed a bit rich) but the gap
> was over .060 ! . I have checked all electrical plugs and connectors
> just in case I accidentally disconnected something but all were OK.
>
> Kevin

What kind of plugs did you put back in? Some Jeep engines won't run on
bosch plugs....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Dropping MPG
 

K-tron wrote:
>
> On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:
>
> >Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> >was initially thrilled with a combined fuel economy of 22 MPG !
> >
> >However now that the temperature is starting to drop here in the
> >frozen north, I am somewhat distressed with the current 14 MPG.
> >
> >Nothing has changed, my driving habits, routes and distances are the
> >same, the only change has been the outside temperature.
> >
> >I am thinking that I may have a sensor going a bit flakey.
> >Anyone have any thoughts ?
> >
> >
> >BTW 4.0L, 4 speed auto, 3.55 rear
> >
> >Kevin
>
> Thanks for the input folks, here is some more info. Yes my area does
> switch to a 'winter' blend but not for another month or so. No I do
> not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
> and grade of fuel are the same. I calculate my MPG manually and
> compare that figure with the on-board smarts, the difference is less
> than 0.1 MPG so that doesn't account for an 8 MPG drop .
>
> The engine temp when hot is 140 C or about 195 F, I wouldn't think
> that this is too cold but I could be wrong. It is at temp after 4 or 5
> minutes.
>
> The only other thing I did was to change the plugs, the NGKs I took
> out appeared to be running OKish ( #6 seemed a bit rich) but the gap
> was over .060 ! . I have checked all electrical plugs and connectors
> just in case I accidentally disconnected something but all were OK.
>
> Kevin

What kind of plugs did you put back in? Some Jeep engines won't run on
bosch plugs....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Dropping MPG
 

I experienced a drop in gas mileage last year, albeit not as severe as
you are experiencing. It turned out the right rear brake caliper on the
ZJ was sticking and the brake was dragging. It's easy to check. A wheel
with a dragging brake will be too hot to touch with a bare hand.
Normally, the wheels will be just warm. In my case I just greased the
pins and the problem went away. My 96 ZJ gets 17-18 MPG in combined
driving and 22-23 MPG on trips. YMMV.

<kevin.dooks@ns.sympatico.ca> wrote:

> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

I experienced a drop in gas mileage last year, albeit not as severe as
you are experiencing. It turned out the right rear brake caliper on the
ZJ was sticking and the brake was dragging. It's easy to check. A wheel
with a dragging brake will be too hot to touch with a bare hand.
Normally, the wheels will be just warm. In my case I just greased the
pins and the problem went away. My 96 ZJ gets 17-18 MPG in combined
driving and 22-23 MPG on trips. YMMV.

<kevin.dooks@ns.sympatico.ca> wrote:

> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

I experienced a drop in gas mileage last year, albeit not as severe as
you are experiencing. It turned out the right rear brake caliper on the
ZJ was sticking and the brake was dragging. It's easy to check. A wheel
with a dragging brake will be too hot to touch with a bare hand.
Normally, the wheels will be just warm. In my case I just greased the
pins and the problem went away. My 96 ZJ gets 17-18 MPG in combined
driving and 22-23 MPG on trips. YMMV.

<kevin.dooks@ns.sympatico.ca> wrote:

> Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> was initially thrilled with a combined fuel economy of 22 MPG !
>
> However now that the temperature is starting to drop here in the
> frozen north, I am somewhat distressed with the current 14 MPG.
>
> Nothing has changed, my driving habits, routes and distances are the
> same, the only change has been the outside temperature.
>
> I am thinking that I may have a sensor going a bit flakey.
> Anyone have any thoughts ?
>
>
> BTW 4.0L, 4 speed auto, 3.55 rear
>
> Kevin

Re: Dropping MPG
 

On Mon, 9 Oct 2006 16:56:09 UTC K-tron <kdooks@supercity.ns.ca> wrote:

> On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:
>
> >Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> >was initially thrilled with a combined fuel economy of 22 MPG !
> >
> >However now that the temperature is starting to drop here in the
> >frozen north, I am somewhat distressed with the current 14 MPG.
> >
> >Nothing has changed, my driving habits, routes and distances are the
> >same, the only change has been the outside temperature.
> >
> >I am thinking that I may have a sensor going a bit flakey.
> >Anyone have any thoughts ?
> >
> >
> >BTW 4.0L, 4 speed auto, 3.55 rear
> >
> >Kevin
>
>
> Thanks for the input folks, here is some more info. Yes my area does
> switch to a 'winter' blend but not for another month or so. No I do
> not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
> and grade of fuel are the same. I calculate my MPG manually and
> compare that figure with the on-board smarts, the difference is less
> than 0.1 MPG so that doesn't account for an 8 MPG drop .
>
> The engine temp when hot is 140 C or about 195 F, I wouldn't think
> that this is too cold but I could be wrong. It is at temp after 4 or 5
> minutes.
>
> The only other thing I did was to change the plugs, the NGKs I took
> out appeared to be running OKish ( #6 seemed a bit rich) but the gap
> was over .060 ! . I have checked all electrical plugs and connectors
> just in case I accidentally disconnected something but all were OK.

I've had tires lose pressure with sudden temp changes. That usually
shows up as a gas hog, especially if I'm loaded up in the rear. A
vacuum leak can also make a big difference.

--
Will Honea

Re: Dropping MPG
 

On Mon, 9 Oct 2006 16:56:09 UTC K-tron <kdooks@supercity.ns.ca> wrote:

> On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:
>
> >Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> >was initially thrilled with a combined fuel economy of 22 MPG !
> >
> >However now that the temperature is starting to drop here in the
> >frozen north, I am somewhat distressed with the current 14 MPG.
> >
> >Nothing has changed, my driving habits, routes and distances are the
> >same, the only change has been the outside temperature.
> >
> >I am thinking that I may have a sensor going a bit flakey.
> >Anyone have any thoughts ?
> >
> >
> >BTW 4.0L, 4 speed auto, 3.55 rear
> >
> >Kevin
>
>
> Thanks for the input folks, here is some more info. Yes my area does
> switch to a 'winter' blend but not for another month or so. No I do
> not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
> and grade of fuel are the same. I calculate my MPG manually and
> compare that figure with the on-board smarts, the difference is less
> than 0.1 MPG so that doesn't account for an 8 MPG drop .
>
> The engine temp when hot is 140 C or about 195 F, I wouldn't think
> that this is too cold but I could be wrong. It is at temp after 4 or 5
> minutes.
>
> The only other thing I did was to change the plugs, the NGKs I took
> out appeared to be running OKish ( #6 seemed a bit rich) but the gap
> was over .060 ! . I have checked all electrical plugs and connectors
> just in case I accidentally disconnected something but all were OK.

I've had tires lose pressure with sudden temp changes. That usually
shows up as a gas hog, especially if I'm loaded up in the rear. A
vacuum leak can also make a big difference.

--
Will Honea

Re: Dropping MPG
 

On Mon, 9 Oct 2006 16:56:09 UTC K-tron <kdooks@supercity.ns.ca> wrote:

> On Mon, 09 Oct 2006 00:07:32 GMT, kevin.dooks@ns.sympatico.ca wrote:
>
> >Hi all, after purchasing the '04 GC I posted about a few weeks back, I
> >was initially thrilled with a combined fuel economy of 22 MPG !
> >
> >However now that the temperature is starting to drop here in the
> >frozen north, I am somewhat distressed with the current 14 MPG.
> >
> >Nothing has changed, my driving habits, routes and distances are the
> >same, the only change has been the outside temperature.
> >
> >I am thinking that I may have a sensor going a bit flakey.
> >Anyone have any thoughts ?
> >
> >
> >BTW 4.0L, 4 speed auto, 3.55 rear
> >
> >Kevin
>
>
> Thanks for the input folks, here is some more info. Yes my area does
> switch to a 'winter' blend but not for another month or so. No I do
> not use an alcohol blend of fuel ( E85 is just WRONG!! ). The brand
> and grade of fuel are the same. I calculate my MPG manually and
> compare that figure with the on-board smarts, the difference is less
> than 0.1 MPG so that doesn't account for an 8 MPG drop .
>
> The engine temp when hot is 140 C or about 195 F, I wouldn't think
> that this is too cold but I could be wrong. It is at temp after 4 or 5
> minutes.
>
> The only other thing I did was to change the plugs, the NGKs I took
> out appeared to be running OKish ( #6 seemed a bit rich) but the gap
> was over .060 ! . I have checked all electrical plugs and connectors
> just in case I accidentally disconnected something but all were OK.

I've had tires lose pressure with sudden temp changes. That usually
shows up as a gas hog, especially if I'm loaded up in the rear. A
vacuum leak can also make a big difference.

--
Will Honea