05-01-2008, 03:13 PM
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#16 (permalink)
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Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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I meant outer circumference / diameter of the tire compared to stock.
If you're running tires with a larger circumference than stock, your odometer and speedometer will be under-registering. Which will reduce your apparent MPG calculations.
The width is another story! (Rolling resistance & aero penalties.)
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