I recently drove roundtrip, PA to FL, and managed to pull 62+ mpg over a 683 mile segment using cruise control set to 55
mph and tires at the max sidewall psi. I probably could have gotten better if I had used my foot but I was exhausted from the trip and just wanted to see what the CC could do. This was mostly the flat part of the drive anyhow. Driving down I was maintaining about 65
mph and had a 700 mile segment at 57+ mpg. If you want to see more you can check out my
mileage log over on CleanMPG.com