I just got home from a 2300 mile business trip to FL. I live in KY. On the way there, I kept the speed at 71ish mph(2000RPMs) and averaged right at 16.25 mpg. On the way home, I drove 76mph (2200 RPMs) and got 17.5 mpg. Also, it was raining on the way home, so traffic was more stop go. Anybody have a reasoning for this difference in mpg? This is the second straight time on the exact same route that this has happened. I thought that the first time was a fluke, but now I don't know why that would happen?