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Look at any brake specific fuel consumption chart and you'll see that any engine is most efficient at a certain load and speed. If you had a small engine that produced just enough (perhaps a little bit more) to satisfy the average power needs running continously at that perfect load and RPM and then used a very efficient hybrid system to store that energy and and administer that energy as needed by the driver, you could potentially have an ultra efficient engine setup, at least in theory.
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