Sailinggod,
Red line? It should only be a matter of at what rpm can one operate at continuously at WOT.
75% load 75% of the time may be good or best for the engine. That was once thought of as the way to run a diesel engine but all the noise scares people. Also consider that 75% load will/can come at a wide variety of rpm. An over propped engine may achieve 75% load at a far slower engine speed while an underpropped system could run at much higher rpm and be at 75% load.
To say you run at ### rpm does not say much about fuel burn or economy unless one knows what your WOT rpm is and how it relates to your rated rpm.
IMO it’s load .. not rpm that wears out an engine.
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Eric
North Western Washington State USA
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