Last year I installed a mid-1980s 4b (NA) Cummins motor in my 32' salmon gillnet boat. I've been running the motor at a steady 2000 rpm and have been burning about 0.8 gallons per hour of #2 diesel. So far I've got about 60 hours on the motor in this boat and I'm comfortable that the motor is settled in and broken in nicely.
Question: What have users of this forum found to be good running speeds for their motors?
While 2000 rpm is smooth and it sounds great, I know this motor is capable of more...but how much more?