Diesel prices around here are pretty high I think, 3.40 about, but I'm not sure. Diesel is great though, I know those F-250 7.2 liter diesel engines can get like 18+ MPG, where as a regular gas F-250 will get <10MPG. I dont know how those VW diesel cars do for gas mileage. But I'm sure they can run forever, diesal engines can go forever.