"Each rpm burns 200 cubic inches of fuel/air mixture at whatever the compression ratio is."
With a 2 stroke ,yes , with a 4 stroke its half , as no fuel is injected for the exhaust stroke.
If your boat is displacement probably 1 GPH is about right at about 5K
If you run 35K itb will be 35GPH (not likely)
200CI would be close to 60-75HP 4 to 6 GPH if run on the pin.
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