Hi Ken,
It takes more energy to turn the larger tire because of it's
heavier weight.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ken Knapp wrote:
>
> You know, one thing I've been curious about is how the tire size will relate
> to mpg - taller tires give you higher or lower mpg. I can argue it either
> way in my head.
>
> Ken

 

Hi Ken,
It takes more energy to turn the larger tire because of it's
heavier weight.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ken Knapp wrote:
>
> You know, one thing I've been curious about is how the tire size will relate
> to mpg - taller tires give you higher or lower mpg. I can argue it either
> way in my head.
>
> Ken

 

On Wed, 2 Feb 2005 22:10:49 -0500, "Ken Knapp"
<nobodysbusiness@goawayspam.net> wrote:

>You know, one thing I've been curious about is how the tire size will relate
>to mpg - taller tires give you higher or lower mpg. I can argue it either
>way in my head.
>
>Ken
>

I drive 135 miles a day to work and back. When I first got my Jeep I
it had 30x9.50's on it. Mileage? Almost exactly 20 mpg.
I went with 235-75R15 replacement tires and my mileage never changed a
bit. Still takes 7 gallons a day to commute.

--
Old Crow
'82 Shovelhead FLTC 92" 'Pearl'
'95 Jeep Wrangler YJ
TOMKAT, BS#133, SENS, MAMBM, DOF#51, SPUNGER#2

 

On Wed, 2 Feb 2005 22:10:49 -0500, "Ken Knapp"
<nobodysbusiness@goawayspam.net> wrote:

>You know, one thing I've been curious about is how the tire size will relate
>to mpg - taller tires give you higher or lower mpg. I can argue it either
>way in my head.
>
>Ken
>

I drive 135 miles a day to work and back. When I first got my Jeep I
it had 30x9.50's on it. Mileage? Almost exactly 20 mpg.
I went with 235-75R15 replacement tires and my mileage never changed a
bit. Still takes 7 gallons a day to commute.

--
Old Crow
'82 Shovelhead FLTC 92" 'Pearl'
'95 Jeep Wrangler YJ
TOMKAT, BS#133, SENS, MAMBM, DOF#51, SPUNGER#2

 

On Wed, 2 Feb 2005 22:10:49 -0500, "Ken Knapp"
<nobodysbusiness@goawayspam.net> wrote:

>You know, one thing I've been curious about is how the tire size will relate
>to mpg - taller tires give you higher or lower mpg. I can argue it either
>way in my head.
>
>Ken
>

I drive 135 miles a day to work and back. When I first got my Jeep I
it had 30x9.50's on it. Mileage? Almost exactly 20 mpg.
I went with 235-75R15 replacement tires and my mileage never changed a
bit. Still takes 7 gallons a day to commute.

--
Old Crow
'82 Shovelhead FLTC 92" 'Pearl'
'95 Jeep Wrangler YJ
TOMKAT, BS#133, SENS, MAMBM, DOF#51, SPUNGER#2

 

Isn't there a leverage problem involved, too? You're asking the device to
move a slightly heavier weight at the end of a longer lever (the radius
from hub to ground).



On Wed, 2 Feb 2005, L.W.([iso-8859-1] ßill) ------ III wrote:

> Hi Ken,
> It takes more energy to turn the larger tire because of it's
> heavier weight.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Ken Knapp wrote:
>>
>> You know, one thing I've been curious about is how the tire size will relate
>> to mpg - taller tires give you higher or lower mpg. I can argue it either
>> way in my head.
>>
>> Ken
>

--
"I defer to your plainly more vivid memories of topless women with
whips....r"
R. H. Draney recalls AFU in the Good Old Days.

 

Isn't there a leverage problem involved, too? You're asking the device to
move a slightly heavier weight at the end of a longer lever (the radius
from hub to ground).



On Wed, 2 Feb 2005, L.W.([iso-8859-1] ßill) ------ III wrote:

> Hi Ken,
> It takes more energy to turn the larger tire because of it's
> heavier weight.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Ken Knapp wrote:
>>
>> You know, one thing I've been curious about is how the tire size will relate
>> to mpg - taller tires give you higher or lower mpg. I can argue it either
>> way in my head.
>>
>> Ken
>

--
"I defer to your plainly more vivid memories of topless women with
whips....r"
R. H. Draney recalls AFU in the Good Old Days.

 

Isn't there a leverage problem involved, too? You're asking the device to
move a slightly heavier weight at the end of a longer lever (the radius
from hub to ground).



On Wed, 2 Feb 2005, L.W.([iso-8859-1] ßill) ------ III wrote:

> Hi Ken,
> It takes more energy to turn the larger tire because of it's
> heavier weight.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Ken Knapp wrote:
>>
>> You know, one thing I've been curious about is how the tire size will relate
>> to mpg - taller tires give you higher or lower mpg. I can argue it either
>> way in my head.
>>
>> Ken
>

--
"I defer to your plainly more vivid memories of topless women with
whips....r"
R. H. Draney recalls AFU in the Good Old Days.

 

I think the larger tire gets slightly better highway mileage because it
rolls farther per revolution, but this is directly offset by the extra
air drag of being higher up into the flow with more of the undercarriage
exposed.

In other words, I think I get exactly the same mileage with 31's as I
now get with 33's taking the difference in odometer readings in account.

I have a regular 200 mile run that I get to check gas brands and octanes
out on. Different brands of 'fuel' make up to 10 mpg difference in my
CJ7!

My speedometer and odometer are exact with 33's on her according to many
GPS checks.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ken Knapp wrote:
>
> You know, one thing I've been curious about is how the tire size will relate
> to mpg - taller tires give you higher or lower mpg. I can argue it either
> way in my head.
>
> Ken

 

I think the larger tire gets slightly better highway mileage because it
rolls farther per revolution, but this is directly offset by the extra
air drag of being higher up into the flow with more of the undercarriage
exposed.

In other words, I think I get exactly the same mileage with 31's as I
now get with 33's taking the difference in odometer readings in account.

I have a regular 200 mile run that I get to check gas brands and octanes
out on. Different brands of 'fuel' make up to 10 mpg difference in my
CJ7!

My speedometer and odometer are exact with 33's on her according to many
GPS checks.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ken Knapp wrote:
>
> You know, one thing I've been curious about is how the tire size will relate
> to mpg - taller tires give you higher or lower mpg. I can argue it either
> way in my head.
>
> Ken