According to my calculations that's how it comes out. If anyone has
something different I'm listening.
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
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Jason Yates
Sent: Thursday, April 19, 2001 9:26 AM
To: dakota-truck@buffnet.net
Subject: Re: DML: Revolutions per mile? Ron Wong? (the on-topic thread)
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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