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The question does not seem to be if they work but how well, I don't think they work well because you are using electricity to compress the air and storing that energy until it's used to power the car, there is a power company that is doing something like this to store off peek electricity but they are freezing it to a liquid state then running it in a modern steam engine, more or less what an air car does with the compressed air, thing is, to make this set up work they need a way to keep the air engine warm and that is why it's not done here but they do play around with it in places like India that stay warm and everyone wants air conditioning, gas engines produce heat as a waste, air engines produce cold.
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