All I know is that I currently drive 124 miles 5 days a week in my v6 S-10 averaging about 22-23mpg which equals $440 every 4 weeks. (Not counting any weekend travel). I am doing some serious hybrid/economy car shopping. I still like the little Smart car so far, but I also really like the civic hybrid that I test drove. The Prius is in too much demand to be affordable right now.