{Insert Catchy Phrase HERE}
As previously stated by others, on flat ground your mileage will improve dramatically, but on a mountain road it can actually cost you. I drive 18wheelers for a living, and I can give you an example: on flat ground with my foot on the accellerator I can usually get about 10mpg, with cruise on the same road I can get 13-14mpg...which doesnt sound like a lot but it's a 30-40% difference over 10mpg.
