mine is a 15 gallon
semi decently healthy 6.0, mostly trail riding, but I also dont putt around all day
It can go all day long and still have a few gallons in the tank. I usually will ride a weekend (friday night, all day sat, sat night) without filling up. For the longer places, I just take an extra 5 gallon can and leave it at camp and that is more than enough....at harlan I just fill up in town each morning before going out.