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Depends on the type of boat. If you have a way to monitor fuel consumption, (ie gals/hour)...create a graph of rpm vs speed and note fuel consumption at each data point. You will find the sweet spots (ie optimal mpg). Belive it or not, it will be at a different speed than you think.
FloScan makes a gauge to compute real time MPG (it uses fuel sensors and input from a GPS)
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