On a Sunday cruise through the country two up I can get 40mpg. a little more spirited ride it's more like 37-38.. Two up with a trailer at hiway speeds it 35. I have 06 Classic, windscreen, and leather panniers, stock pipes with cat box removed. I do use mid- grade and somtimes preimum, I find I get less decel popping with higher octane, and I stay away from the discount stations. Here in Michigan they are usually 10% or more ethanol. My bike doesn't like that stuff. I try to stick with Shell, Marathon or BP....