Something is really wrong with the fuel consumption you've quoted. I've had 8000 pound boats that used less fuel. My 248 Offshore with twin 140's would run a 30 miles on 32 gallons with smooth seas.
1.6 litre parts are cheap, if you can get the HP up maybe you can re-prop to cruise below 4000. As long as you're cruising at 4500 you can forget about mileage with that crossflow motor.
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