I have BUBS, FREAK, jetted and went from about 50 mpg to anywhere from 40-48 mpg with an 18 tooth front sprocket. It all depends on how I ride and how much I work that thing I have to twist to make'er GO. I use the mid range gas instead of the premium. Setup and how you ride has a lot to do with it. My brother has a Big Dog, one bad machine with a 6 speed trans and he gets somewhere around 60 mpg go figure

BA has Freak, 160mains, 44pilots, air mix3 1/2 to 4 turns, BUBS dresser dogs. Never had more fun on any bike - 2nd bike 2008 RIIIT