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Really depends on which diesel you have.
Some are designed to run at lower RPMs (cat,mac,cummins ect..)
My Yanmar is a higher rpm diesel.
They want it run at 90% most of the time and don't like extended periods of idle (trolling)
I run my 315 @ 3000 - 3200 most of the time at cruise,. best speed + economy for me @@ 5-7 gph.
I max out @ 3900
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