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Old 01-05-2013, 01:24 PM   #4
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But why are you expecting a 3mpg gain from the shutters if the EPA rating is only 2 mpg higher, and that's with the use of lower rolling resistance tires and aero wheel covers? So if the combination of the shutters and wheels/tires gives you a 2mpg gain, I don't think you can expect more than 1mpg from the shutters alone.
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