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MPG change when upgrading to 20"? MPG change when upgrading to 20"?
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Old 05-18-2014, 10:36 AM
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Join Date: Mar 2011
Location: VA
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jinhao is on a distinguished road
rotational mass remains the same but i'm going from 255/50R19 to 275/40R20. I know it already has more area in front of the wheel when it comes to aerodynamics but such a big car I don't know if its that significant.

3-4mpg is a pretty significant difference.....
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