I would go with the biggest motor you can find. With the larger hp you won't have to run the motor as hard thus using the same or less gas as a smaller motor having to run harder. I have a 1990 225 yammi and my gph at 30 knots is the same as the 225 optimax on my towboat (commercial 22 whaler). My v20 is lighter and 30 kts comes at 4200 rpms. On the towboat its at 5200rpms
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