2011 800 Power Tek Summit 154.....I can only get 80 miles per tank. I need to be at 115 to 120 for the type of riding I do. Does anybody have any answers as to how I can get more miles out of each tank or do you know of an aftermarket tanks that will get me the mileage that I need? (Without carrying an extra tank). It seems like I'm only getting 8.3 gallons of usable gas....Is this typical? This is my first Ski-Doo.