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Cd - you have to consider that they were testing a stock car with a naturally high Cd, though, and no airflow improvement at the rear. Obviously, any change to the windshield angle would not alone be the end-all be-all of aero, but would work as an aide to keeping the flow smooth over the top of the car and off the boat tail, if it existed.
What I'm saying is that there might be more of a gain if the car had other aero mods.
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