It wont be very good, but you could fill the tank full and make a two hour run and top off the tank, divide the gallons used and that will give you a rough idea of the hourly usage gallons per hour.
Don
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1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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