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Where do you get the kind of air pressure to recharge your air powered car and where do you get the energy to run it?
Alot of compressed gas's that are sold are not pumped as much as they are frozen to compress them.
Also things like small propane tanks are one time use only because they are so light weight that you are not allowed to transport them, it's a DOT rule not a propane rule, that is why you can get home refill kits for filling them off larger heavy tanks but you will never find a store that will refill your small hand held tank.
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