Hey Oldboat,
Kinda depends on what you want to do with it. I have a 100 gallon tank with a 300 hp Suzuki. I regularly make 20-40 mile runs offshore. At 27 knots cruise I am burning right at 10 gallons an hour. Bump it down to 22 knots and I am way better than that. The new technology is pretty efficient for sure and my boat is WAY heavier than your with a tower and second helm. Good luck with the rebuild!!!
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