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  1. #1
    My Boats:
    1996 Active Thunder 32 Thunder
    Join Date
    Apr 2003

    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

  2. #2
    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.

  3. #3
    Platinum Member Platinum Member
    My Boats:
    fuel injection, superchargers
    Join Date
    Jan 2001
    PA and MD
    HP times 0.08 = GPH at WOT for EFI and

    HP times 0.10 = GPH at WOT for carb.
    Cobra Terminator 3000, single engine 30' true tunnel cat
    Home of the "ON-BOARD-DYNO"
    Stellings Bravo Extension Box with a built-in DYNO!
    Reads 0-1000HP and 0-1000TQ in the water, on the fly, while you drive!
    Search OSO 'on-board-dyno pictures" for details.

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