Gph
It is almost impossible for me to know the GPH per season. When trolling with the 9.9HP the fuel burn is pints per hour. When headed out to fish the usage is closer to 25 GPH. I do not have a Hobbs meter on the fishing boat. In the 280 SS most of the hours are at 13-1500 RPM. We do lot's of putting around. When on plane I try to never exceed 3000 RPM as that is the optimum MPH RPM for the boat.
according to the Hobbs meter on the boat, the engines ran 101 hours in 2013. The fuel burn for the boat was 475 Gallons. GPH was 4.75. Pretty good for a 600 HP Boat. Proof that the heavier your hand is on the throttle, the harder your fuel bill will be on your wallet.
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