My Indmar 8.1 with the X45 would run about 10 gallons per engine hour depending on what we were doing. Ballasted wakeboarding and hardly ever crashing would run 12 or more, same with cruising 34 MPH with a full load of people. Tubing unballasted and such would be a little less. On a very busy day, we would rack up 6 hours on the meter, between lunch stops, swimming and shutting off to change riders.
I can't imagine that the PCM would be all that much different.
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