What I find interesting is the speed you are choosing to run.
I can run my boat at 10 knots and get like you about 1 nmpg.
If I reduce my speed by just one knot my fuel economy goes up 50% to 1.5 nmpg. My boat also "sounds" happier to me. My level at the helm shows a flat running angle, and my EGT's go down by 200 degrees.
So... I choose not to run at 10 knots. If 9 knots is not fast enough(rarely the case) , or if the sea state bounces us around too much(more often the case), we ramp up to a 14 knot cruise speed at 2400 rpm.
Last week for the first time I wan at 2800 rpm and 19 knots for an hour running from a thunderstorm, but that was a one time thing.
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