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I wouldn't worry about approaching the maximum theoretical efficiency on the first prototype. As the OP notes, we have a pipe that is now wasting power with a restriction where there could be an air motor, so it's all free.
BTW, I think there is also great potential for this in refrigeration. Using an orifice to restrict flow heats the refrigerant through turbulence as well as wasting the mechanical energy.
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There is no excuse for a land vehicle to weigh more than its average payload.
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