Joel:
Theoretical hull speed (it is theoretical as it is the speed at which the hull matches the bow wave) of that boat, assuming a 37'waterline is 1.34*sqrt(37) or a little more than 8 kts. Semi displacement hulls take about 2-2.5 hp per thousand pounds of displacement to reach hull speed as a rule of thumb. Your displacement is about 25,000 lbs with fuel, water and passengers. So it takes 50-60 hp. Those engines make about 17 hp per gph at low power. So it burns 50/17 to 60/17 or 3-3.5 gph for both engines.
All of the above is based on rules of thumb, but they should be good to 10-15%.
Those engines will last almost forever at that low power output. But push it to 15 kts and they won't.
So go slow.
David
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