What is the most fuel efficient speed?

Answer 1

I have found that for my Scion Tc the most efficient speed is 57 - 61 mpg. If I speed up slowly, slow down by coasting, and set my cruise control on while driving on the highway I can get well over the estimated 30 mpg. Like most things fuel efficiency depends on the vehicle. But somewhere between 55 and 65 should be right. Test it out for yourself during your daily commute and see. There are also some really good articles written about something called Hypermiling. I do not consider myself one of them but I do use a few of there techniques (the ones mentioned above) in order to be more cost and fuel efficient.