Without a flow meter, the most economical RPM to run is normally around 3600-4000 if your propped to spin up to the high side on your WOT RPM's. A fuel flow meter is the best way to figure it out though. My boat gets about 2 NMPG from 3500-4300, the fuel consumption and speed both go up proportionaltly to each other. At 4300 the fuel burn begins to go up faster than the speed, and at 5400 they come back and almost match each other again. I can get right at 1.8-2 NMPG running flat out on mine, but it isn't very forgiving when you hit a wave at 50.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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