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I have 1991 Crusader 454's and run them at 3100 RPM and achieve 19 knots, my boat is a 29 Ocean Yachts Express with Tower. I was talking to a buddy who has the same engines in a Bertram 33 FBC and he runs his at 34-3500 RPM, as it is more efficient. He burns 29GPH at 3600 RPM, and 26 GPH at...