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Does anyone know if the 20 inch tires that GM offers with the Texas Edition package affects gas milage? The posted mpg uses 17 inch tires.
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Probably very little if any. It really depends on the tire/wheel weight combination. The 20" wheels might weigh a little more and provide a little more rolling resistance. It also depends on the wheel material (steel vs. aluminum) - Aluminum weighs significantly less than steel.
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