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I think in gross terms, most people fail to recognize the HUGE volumes of air involved in the automotive aerodynamic equation, conservatively speaking, the air within 15 feet around a typical car and 150 feet behind it, is seriously disrupted by the passing of a car. The math works out to approximately 150,000 cubic feet of air per second passing over the body. I find it difficult to believe that the minute amount of air at the boundary layer region is going to have much impact on this. Big picture thinking calls this one an impractical way of doing things...sort of like saying that if we could get a sparrows wings to beat fast enough, it could propel a Cessna.
But if you want to believe that the 1/2 inch layer of air around the car is all that matters in aerodynamics, feel free to keep deluding yourself, good luck, be certain to report back your results.
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