I've thought buying a Prius for a commuter car...3 of my coworkers have them, and I know many people back in Denver that have them. My Jeep on a good day gets 19mpg, so I'm spending about $70/week for gas now, which isn't bad, as I was spending $45/week for gas last year. My next new car will probably be something smaller and more efficient...maybe the new diesel Jetta. I don't like really small cars, though, but the Jetta is a reasonable size.