Exactly what I'd expect to see, Bill not withstanding. You can run into
some issues if the tire size change is enough to get you in a bad spot
in the power curve(too high in 4th, too low in 5th) for your normal
driving speed.

Old Crow wrote:

>
> Greg wrote:
>
>>Daughter's 95 YJ with 2.5 sucked on gas stock, sucked on gas with 31"s,
>>and still sucks on gas with 33"s and 4.88s.
>>
>
>
> My '95 YJ with the 4 cyl. Had 30x9.50's on it and now has 235-70's.
> On a measured 135 mile round trip commute it averages 20 mpg...with
> either tire on it. Just has a bit more pick up with the 235's
>
> My wife's '94 YJ with a 6 cyl. Had 215-70's on it when we got it. Now
> has 30x 9.50's. On the same 135 mile commmute, it also averages around
> 20 mpg.
>
> The only way tire size seems to have affected the gas mileage was by
> the change in the speedo reading. Over an actual measured course, not
> using the odometer as a reference, the mileage didn't hardly change.
>
> --
> Old Crow
> '82 FLTC-P "Pearl"
> '95 Jeep YJ Rio Grande
> SENS, TOMKAT, BS#133, DOF#51, MAMBM
> "There's only *one* RE"
>