If the car were supersonic, something like that might potentially cause a shock wave to start ahead of the car and miss the rest of the body. I can see that *mayyybeeee* reducing drag. But at the extremely low subsonic speeds we drive at, I'd be shocked & stunned if it was proven to actually work.
It shows a thought process in the OP that seems to be not too far off, though. I'd believe something like that quicker than I would magnetized fuel, turbulenced intake air, 2 oz. of 'snake oil' in the gas tank, or self-generated and burned hydrogen wizardry...
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