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I may be wrong, but if you have a way of either efficiently absorbing and replacing the heat during compression and decompression, or a way of efficiently insulating the heat in under compression so it's there when you decompress, then that should raise efficiency.
It's when you compress the air, lose the heat after and not during compression, then decompress the air without letting it heat up in some way or form during decompression, that's when pneumatics are inefficient.
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