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Gph
I have a 170 CC With a 60hp yamaha 2 stroke. I'm not sure what my rpm is (tach ain't working and haven't had time to fix it.), but at 30 mph through calm water with 2 adults + gear I seem to be burning 3.5-4 gph. Your 4 stroke should be a little more effecient. Hope this helps
Frank
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