Fuel burn is totally dependent on how fast you go. For my boat a 5 knot cruise speed will burn 0.2 gph, 6 knots is about 0.4, 7 knots 0.75, 8.5 knots 1.8 gph and 9.2 knots (wide open throttle) 2.3 gph. So pick your speed to get the fuel burn you want. My boat is 32'8" with a 32' LWL and a 9,500 lb displacement. LWL, displacement, hull form and speed determine your fuel burn.
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