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any math formula to get mpg or gph

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Old 07-29-2003, 04:03 PM
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Question any math formula to get mpg or gph

Does anybody know a quick way to figure the mpg or gph for my 310 sunsport 454's bravo1 and 8200 dry weight 160 gallons of gas. I can cruise at about 3400 rpm
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Old 07-29-2003, 04:31 PM
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I heard something like 10% of your horsepower,then divide by 2 would be your cruise gph. Give or take a gallon or two. West Marine has a formula on the web.
 
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Old 07-29-2003, 06:11 PM
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HP times 0.08 = GPH at WOT for EFI and

HP times 0.10 = GPH at WOT for carb.
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