Edmunds, “where smart car buyers start” compared “three cars from their long-term fleet known for squeezing extra miles out of every gallon of gas: the 2008 Smart Fortwo, 2008 Ford Focus SES coupe, a 2005 Volkswagen Jetta TDI, and a 2008 Toyota Prius.”
If you are serious about saving gas this is a great video to watch.