Hey guys, I have recently got my boat fixed and only gone out on it twice since. I am trying to get an idea of how far I can go, and safely return without running out of fuel lol. Is there anyway to get a better estimate than just trial and error? Its a 1989 48hp Johnson, #J48ESLCER. I read somewhere online that for most two stroke motors you can just divide the HP by 10 and get a rough estimate of its GPH.