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Apparently you've rather fixated on the layer of air within a few inches of the car, while not totally insignificant, it is really pretty insignificant compared to the huge volume of air that is being affected by our vehicles as we plow through it.
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While what you are saying it true, it is mitigated by the fact that the energy imparted to, and recovered from, the air is less per unit volume at a distance than at the vehicle's surface. The fall-off is logarithmic, while the volume grows cubically. The article (which is hard to quote) on the first page divides the boundary layer itself into three.
It's going to take me a while to translate that into LOLspeak in my head.
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You want to reduce the drag of a pig?
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You'd wind up with a porpoise.