This is the change for me... I get 20-21mpg at 52-55 mph... only 18-19 at 65. It means staying in the right lane as much as possible to keep from getting mowed down, and making sure I leave early with extra time to get where I'm going at a slower pace, but it means a tankful will last a little longer.FATCAT said:- No more driving over 65 mph.