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To me, I think hydraulic energy recapture is the best way to go when talking about efficient tires. Mate a very efficient, hard tire with very good (computer controlled) suspension that can capture some of the bump energy and use it for forward propulsion.
I don't know much about tires, but I'd worry about harmonics with a tire/wheel like this. It seems like (in the right situation) this wheel could act like a car with springs but no dampers.
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