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I think the best way is to find a BSFC chart for your engine and note the sweet spot.
Failing that, I've been using a 1000-1200 ft/mn piston speed theory that postulates best or near best efficiency is found in that rpm range. I am still not sure about the validity of it but I've run the numbers on many vehicles and even if it isn't perfect it isn't going to be too far off.
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