I had to get my first tank of gas in my bike today. The main ran out at about 135 miles, and I had at least a 5 mile reserve (before I found a gas station). So, at 140 miles, I put in 2.865 gallons of gas, giving me 48.8 MPG.
I'm sure I'm not the most efficient at shifting yet, so I think I can get that to 55 with more experience. Still, much better than the 13 MPG my truck is getting!