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Same question different boat. 2021 Boston Whaler 280 Vantage, 65 hours, twin 300 Verados, Lake George NY, 300 ft above sea level. Boattest.com and Boston Whaler performance info show 6000 rpm. In April and May she was running around 5500 rpm. Now down to 5250. one person onboard, trimmed out I understand air temp and density. Dealer has nothing to0 do with the setup of boat, motor, propeller, mounting height. At 70 and a life time of boats. I was taught you want to be at high end of rpm with out going over. Does this still hold true? or is a prop change in my destiny. I never owned a V8 outboard