I have a 3GM30F and according to Yanmar's recommendation you should cruise @ 80% of max RPM which works out to 2850 RPM's for me. Reading the Torque / HP dyno curve and fuel consumption provided that's spot-on max Torque and the most efficient fuel consumption. It's also the sweet spot from a vibration standpoint
I also run it @ max throttle for at least 5-10 minutes every time I go out A couple weeks ago I had a pleasant surprise with the engine firing instantly after sitting 12 weeks in the yard for the refit. I guess the Diesel Kleen Power Service fuel treatment I used last fall / winter finally de-gunked the injectors. I hope it keeps being sweet. -Francois 1990 34+ "Take Five" Lake Lanier, Georgia Sent from IBM Notes Traveler
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