Gas mileage is dependant on ridding style. The harder you ride the fewer mpg. I have heard numbers as high as 50 mpg with the stage one setup. Personally with the stage one kit the best I ever got was a high of around 42 mpg. My average as I got more comfortable with the Pin was usually closer to 38-40mpg. I recently had the S&S airbox and Vance & Hines pipes with the remap. I have seen a low of 33 and high of 40. I have been riding with a friend who has a 900cc Yamaha one of the R for race bikes, and been ridding a lot more aggressivly. Holding shifts and r´s in gears. Kills the mpgs but sure is fun. These bikes beg to be ridden and will corner with the race bikes right up till you grind the pegs or floor boards. ;) If you want mileage everything on the momocycle working correctly, try keeping the rpms low and shift early. The other option is the overdrive pulley. But please if you do it check out other Victory forums and make sure it is done correctly or you can have a real expensive repair.