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GM has one of the biggest wind tunnels in the world...
The Corvette isn't a low powered super mileage hybrid. Big engine, big brakes and big performance creates a lot of heat. Cooling takes priority so stuff don't break. They've done a great job of managing airflow in and around the car.
I fully expect the Cd to be 0.28 or better, or at least a good compromise between low Cd and cooling effectiveness. You don't get 30 mpg highway out of a big V8 with horrible aero.
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