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new tires gas mileage drop 200

posted by  B.C. on  Fri Aug 28 16:25 CST 2009
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last visit: Wed Mar 28 22:28 CST 2012
[RELATED]

Find a site that makes the math of comparing tire sizes to determine speedo/ODO error when running rear tires of a non-stock size.

Sorry, I don't have a site for you, I'm not on my own computer.

The speedo/odo measures rear wheel revolutions, and how far the car moves per rev is built-in according to the tire diameter. With taller than stock tires, your car moves a bit farther than the speedo "knows" so you have a error in both speed and miles driven.

Probably not a large error, 2 percent or so (SWAG). Be aware that the car is going faster than the speedo says. Important in 'Aggressive Enforcement' zones.

Also, the actual miles driven is a slightly larger number than your odometer says, so your gas mileage could be better than you think.

Regards,

Bob

:>)





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