Ok this may sound really stupid, but my truck came
with 215/75/r15, now I have 235/75/r15, what is my
percentage difference...no onehas messed with my
computer. I wonder if I am actually getting better
mileage than I think. -Seth
--- Jason Yates <onebad4x4dak@yahoo.com> wrote:
> OK . . . you've got me wondering here. My truck
> came with the
> 31" tires (so the CABS should be set to 689 already
> right?). I
> changed to 32" when the bad-years wore out. I
> haven't had the
> computer flashed or anything. I thought my mileage
> would only
> be off by the difference in percentage of
> circumference between
> the 31" and 32" tires which is like 3.1%. If what I
> am reading
> here is correct, the real difference is 9.3%? I'd
> appreciate
> the confirmation.
>
> Thanks,
> JY
>
> --- Ronald Wong <ron-wong@home.com> wrote:
> > Nothing to do with trig. Just good ole fashioned
> geometry.
> > The difference
> > around the outside of the tire is called the
> circumference.
> > Circumference =
> > diameter X pi. The tire revolutions per mile is
> the number of
> > times the
> > tire rolls the length of the circumference. If
> you have a 32"
> > tire you are
> > right in your calculations. That percentage is a
> whopping
> > 9.3%. The next
> > time you calculate your mileage, multiply the
> mileage your
> > odometer says
> > you've gone by 9.3% and add that figure to the
> total because
> > that's how far
> > you've actually gone. Divide that by the number
> of gallons of
> > gas you used
> > for your MPG. This all presumes the dealer
> flashed your CABS
> > to 689.
> >
> > Ron
> > 00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
> > For modifications see my DML Profile (URL follows)
> >
>
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
> >
>
>
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