not sure if that has been already said.
There is always an optimum speed for every engine, so called "cruising speed". Cruising speed slightly differs but it seems to be between 10 and 11 knots for most boats. Try setting 10,5 knots and ask for maximum range. You can go about 20% further then at a speed of 8 knots (2/3).
I always try to go on cruising speed over large distances. And then switch to slower speeds when patrolling. Thats the best way to save fuel.
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