It depends upon the specific gravity of the particular gasoline blend.
In general, you can figure on around 6.2 to 6.3 lbs/gallon. If you
kept 10 gallons out of the tank you would save around 62 pounds. Not
enough to even worry about. You will also be stopping twice as often
for fuel. Much better to fill the tank every time.

----

On Fri, 20 Aug 2004 22:16:18 GMT, "Mindy"
<savagebrave@worldnet.att.net> wrote:

>was knocking this around with the guys at work:
>
> I am taking a long drive out west from the DFW area in my 2001 Grand
>Cherokee...do some 4 wheeling in Sedona and Vegas....
>
>The question is, do you get better gas milage out of a half tank of gas vs a
>full tank and the added weight thus of...this considering I will have
>changed the oil, new air filter and adjust the tire pressure before leaving
>out...
>
>Thanks all you great minds of Jeep owners.......
>
>
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