Mileage is incredibly variable. I've always looked to chase mileage to no avail, but this past week I found some things out. As you go higher in altitude, mileage gets better. At highway speeds, I typically get anywhere from 30-35 mpg. As I headed west, I found I would occasionally get up to 40. On back roads, I got as high as 50, which is unheard of at home. Rode 2100 miles over the last 3 days with a guy on a bone stock 09 Ultra. My Limited has pipes, air cleaner and tuner, and of course the 103". He was running single with luggage, and we were riding double up with more luggage. Each fill up, we'd take within 2 tenths of a gallon of each other, with me taking more by just a bit.