My average over the 17,000 miles since I started using Fuelly is 69.5mpg. My three best are 79.2, 79.5, and a whopping 79.8 on July 17, 2015. I have found that speed is the killer on my bike's mpg. Those days were riding between 35 and 50 miles per hour in the mountains of Georgia, North Carolina, and Tennessee. It wasn't so much how hard I rode the bike, but was more so that I didn't ride fast.