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Formula for correcting odometer error?

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Old 05-05-2008, 11:34 PM   #1
JBeasty [OP] JBeasty is offline
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Formula for correcting odometer error?

I'm considering going a bit larger on my tire/wheel size, and was wondering if there is an easy math formula to calculate my odometer error, if I know the speedometer error.
For example: my stock tire size is 215/70/15 (26.9"), and I may go to a 225/70/16 (28.4"), which would give me a speedo error of 5.8% (a 60 mph reading on my speedo would now actually be 63.5 mph), courtesy: http://www.miata.net/garage/tirecalc.html
I just want to be able to calculate gas mileage accurately.
If I multiply my odometer reading X the % error (.058), then ad that to original reading, I should get the correct mileage . . . right?!
For example: trip odometer reads 320 miles, so 320 x .058 + 320 = 338.56 miles.
This seams right to me, but I'm no Mathametician. Can anyone enlighten me?
Thanks, JB
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Old 05-06-2008, 02:17 AM   #2
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yep pretty sure you got it there. simply doing 1.058x320 will give you the same answer too.
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Old 05-06-2008, 10:04 AM   #3
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Oh Yeah . . . duh! I knew it was a good idea to check with someone first.

Thanks, JB
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Old 05-12-2008, 06:08 PM   #4
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Buy a Scangauge too. That'll let you adjust for larger tires so you have an accurate speedometer reading as well as distance with it's trip meters. I use mine to watch my speed around cops instead of trying to remember it's off 3.54957489 or whatever mph!
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