I've put on 1600 miles in the last few days on my 2006 10R and I was keeping track of my gas mileage the entire time. The standard deviation or average miles per gallon is about 35. I saw as high as 38mpg when I was using 6th gear for my speed limit stuff. When I was riding agressive, such as lower gears higher up the tach, I was pushing about 30mpg.
On another note, there were two times when my fuel light came on and the next stop for gas was quite a ways away. The first time I made it 38 miles with the fuel warning light on, and the second time I made it 35 miles with the light on. Keep in mind, once I saw the light came on, I never went faster than 75-80mph and I was always in 6th gear.
Hope that helps!