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I drive a Scion xA, with a stock Cd of 0.31. So it is pretty average to decent. All vehicles have drag and the drag always goes up with the square of the speed.
What percentage is the 2MPG on the Impala, and the 7MPG for the Aveo? How do their Cd's compare?
My aero mods have helped a lot -- I am averaging ~50% above the 30MPG EPA Combined year round, and at least half of that is aero improvements. So, I think aero drag is critical on all and any vehicles.
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