hey guys, i just purchased a 16ft bayliner capri bowrider w/85hp force ob-external fuel tanks-took it out yesterday( the boat flies-2 larger adults and one large child) getting 43mph at speedo-but when i troll at slower speeds (like for fishing) after about 5 minutes i get a fume alarm-is this normal and i shouldn't be trolling with the 85hp?? also i have a 6.5 gallon fuel tank mixed at 50:1-what should my consumption be?? it seems like i used 2-3 gallons in a hour and a half of bombing around full throttle with the occasional trolling?? thanks for any help