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Past 50 mpg, the energy used to push a car through the air gets progressively smaller. Your saving fractionally small amounts of energy when your mpg starts to skyrocket. So the ratio of propulsive energy saved, to the energy spent actively blowing or sucking in air correcting aerodynamic drag becomes a losing prospect. For high mpg, passive aerodynamics is best.
Though if you want to go really fast it might work. Aerodynamic drag at high speeds becomes like a brick wall. It may be easier to redirect that horsepower to better aero than to waste it overcoming drag.
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I try to be helpful. I'm not an expert.
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