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They often talk about these cars having a huge air tank presurized to a simaler presure of a scuba tank, about 3,000psi, and that is alot of energy, not something you would want to get in an accedent with, or have built by the lowest bidder.
Also, if you are compressing air, yes your air tank is going to heat up and that is a bad thing as it will then hold less air, and as it cools down you will loose that presure, I've used a number of compressers for air tools that have cooling fins on the air lines coming from the compresser so that air going in to the tank is as cool as possible, the compresser is going to work more efficently that way, even if you were to store that heat, then as the air passes thru the air motor and cools it will condense and drop in presure, that is why if you can have a radiator that warms that cooling air, you will go farther on a tank of air, but that only works in warm places like India... where cars like this are being used.
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