I made the plunge on Sunday and bought a '01 TDI with an upsolute (sp?) chip. I was very worried that the "chip" would be at the expense of MPG. Well, I could not be more pleased, we got 54MPG on the drive home (300 miles) and the car is really fun to drive - the chip seems to make all the difference in "fun" factor compared to the other TDI's we drove when we were looking. Is there any downside to this chip? After two days I have no buyers remorse (like I did when I bought the Suburban!) - great fun to drive and I get a lot of heads turning my way - kinda fun!