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Bad Mileage 4.8i Sport Wheels. PSI Problem? Bad Mileage 4.8i Sport Wheels. PSI Problem?
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Old 05-21-2016, 10:31 AM
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Wheel and tire weight matter a bit, tire width matters a lot. Higher inflation helps reduce rolling resistance. Diameter shouldn't matter unless it is causing your speedometer/odometer to read low (deflating MPG).

Look at the rear tire size on the i8 - there is a hint in that for getting higher mileage.
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