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Back when I was street racing (oh the horror!) There was a semi physical limit on how fast a piston should travel and not self destruct. IIRC, it was mostly about skirt wear and rod or wrist pin strength. Not much related to efficiency. If you know displacement and rpm you can calculate volume and perhaps mileage but that would be above my pay grade
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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