Bikes don't have gas gauages. You probably have like a 3.5 gallon tank at most so it won't take a rocket scientist to figure out how much you get to a gallon and how much you get per tank. I figured I get about 37mpg on my bike, I have a 3 gallon tank which kinda suks cuz it's so small but I set my odoometer when I go for a long ride and I can go a little over 100 miles without filling up, a little longer if its highway driving at steady speeds. I fill up pretty frequently anyways, I like to stop and have a drink and a smoke so I fill up wheil I'm doing that.