Re: GPH numbers on 18' w/ 115
One pound of fuel will produce 2 horse power per hour. Figure a way to do better and you can get rich fast. Gasoline weight is 6 lb/gal.I have 150 Yamaha. Running at 75% is 112.5 Hp. Formula: (112.5 x .5)/6 = 9.38 GPH. Formula works for anything. No mater if it's a lawn mower or airplane.
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David Bienvenu
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