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You don't just get energy for free. To keep a car moving you have to overcome frictional losses from the tires as well as air. To generate energy to compress air, you have to take it from the moving car. You'd be converting kinetic energy into potential energy of a sort. The point is, you don't do anything for free, and each step has losses from friction (heat). So no, you can't just fill your car with compressed air and drive off at 30mph, turning an alternator to power a compressor that compresses more air to keep you moving.
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