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Each boat and engine combination performs a little differently so to get the max performance one needs to experiment to get peak performance. Also running at displacements speeds, less than approx 8.5 kts for your boat length you can get significantly better fuel economy. For example I run a 37' Tolly and get 3 nautical miles per gallon (total) at 1200 RPM however at 1350 RPM, I only get 1 nautical mile per gallon and only going about .5 kts faster. My point being that 1500 on a diesel of this engine/boat size may not be an efficient speed.
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