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ummm did you not watch it, the fuckin compressor would be powered by the engine and the compressor would charge the tanks back up so the engine could keep running. the air isn't recharging itself, it's powering another device which recharges the tanks that allow it to recharge.
also I was thinking once the vehicle is in motion the rotation of the wheels could be turned into energy used to power the compressor to recharge the tanks.
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