Compare to what? A car? Yes, most cars can go over 200 miles in one tank but your Bandit only has around 5 galons. At 40MPG that is 200 miles to dry (ie pushing it to a gas station). The reserve is over 1 galon so that would be around 140-150 when reserve goes on. Check out fuelly.com to compare it to other owners (better yet join them and add your stats to the rest).
Remember 100hp for something this light (including rider) is a LOT of power per pound. These things give mileage at par of the best of the econo car but perform at par to the best of sports cars and you are complaining?