on my 89 20 SF i pulled a 70 gallon tank and replaced it with a 50 gallon tank. Moved the tank about 16 - 18 inches forward for self bailing. I'm going to be running a 115 2 stroke so i dont think fuel will be a problem.
I'd say it depends on the application, how much you use the boat, and how far you usually fish. I wouldn't want an 80 gallon tank on a boat that has a 140 4 stroke that i only use once every 2 weeks. That just means ill have fuel sitting all the time....not good.
If you fish every day, have to run 20 miles to fish, and that 150 is a thirsty engine..........80 is not too much.
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