A myth that I think is the cruise control myth. Supposedly if you are on the highway they say to use crusie control to maintain your speed. I might be able to see this on a flat surface but anywhere with hills I could see this being way mroe ineffecient. I mean haven't you ever turned the cruse off for a minute so you could turn and then for the hell of it press resume after the turn? You buy like a gallon of gas getting back up to speed.