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It would be interesting to have a "real-life" test of how much power you could get back out compared to what you put in.
Even if it wasn't super-efficient, electricity is pretty cheap, can be renewably-made, etc.
I think the main limiting factor is how much air you can bring with you.
Even if it wasn't a lot, it might still be fun on a bicycle, because you can always pedal anyways.
A person might also be able to design some sort of air piston or some other device that might use the air more efficiently than an air drill.
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