Averaged 19.4 mpg Buffalo to Naples, Fl, driving relatively hard 75-85, which included the Appalachians.
Averaged 19.4 mpg coming back!
Today, had to travel about 350 miles round trip for business. Decided to keep it slow and drove 62-65. Ended up with 21.6 mpg.
I've decided that for 2 mpg, it isn't worth it....