The tank is not as large as advertised. The fuel pump takes up internal volume. Ive run out of gas a couple of times and maximum ive ever pumped is just over 3 gallons. With microtec ecu and slip ons i get about a max of 80-90 miles before the light and somewhere between 15 and 20 miles on reserve before bike runs out of gas. The maximum mpg ive gotten on the bike was 35-36 mpg. Plenty of people have run out of gas on these bikes. Try a search for more feedback.