My Ninja 250 gets 70-80 mpg the way i usually ride it. I once got 90 mpg on a tank, but that was no fun at all. Worst ever mileage was on a very fast (for me) group ride where the next smallest bike was a 750: 58 mpg. Sure, they could leave me on the uphills and straights, but i could catch them in the twisties. :)