Originally posted by deevergote.
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As for the tires, they may cost a little bit of MPG, but I doubt much. I was averaging 35 MPG in the CM's on the highway lately, and they are a lot bigger, heavier and have much bigger tires. 1-2 MPG maybe at the top end. It would probably worth the stability though. Perhaps the combo of the tires and aero bits result in a net wash. Isn't the sport rated the same MPG as the base?
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