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A quick way to test the Prius C (or any other car's) aeromod mpg gain potential is to note what the mileage improvement is when drafting, as that is the mileage improvement you could get by reducing the Cd. When drafting, the only thing that has changed is the wind load (which is the only thing being changed by aeromods) because of the reduced wind speed behind the drafted vehicle. Rolling resistance, engine/transmission rotational losses are unchanged.
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