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"I doubt it. I believe engines are most fuel efficient around their torque peak."
A throttled gasoline engine is always most efficient running at wide open throttle at the torque peak engine speed, because the lack of pumping losses and the fact that the torque peak implies highest power output per revolution.
Note that I said efficient; that’s different than economical.
It’s more simple than that; the most economical speed is a slower one.
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