Stock the bike has a two gallon tank and gets 50+ mpg so 100-120 miles. After Vortex and exhaust the fuel economy has dropped to low to mid forties average and I now have a three gallon tank so 120-140 miles. There's a 4 or 5 gallon tank on the market now as well. I carry a one gallon fuel bladder and/or 1L MSR fuel bottles when I need more range than what the IMS 3.0 tank can offer.
Your range will vary based on mods, altitude and how heavy handed you are with the throttle. I have seen as low as 37 mpg and damn near 60 mpg when it was stock. With the Vortex and exhaust at altitudes of 10,000-14,000ft ASL I saw 51 mpg average.