So yeah. I bought a 2011 VW Tiguan about a year ago. It takes high grade 90+ octane gasoline. Since I've owned the car, prices at the pump have done nothing but climb. So I'm kinda kickin myself and thinking about offing the Tiguan and going to a TDI. Yeah, the TDI will get 40 MPG or better. The Tiguan topped out at about 27 MPG on one downhill stretch of hiway, with the wind at my back. Typically, I get about 23 MPG in it. In spite of what seems like obvious benefits, I still have to ask: IS diesel really "better than" gasoline in a CAR? Guess it's just the ever-present skeptic in me. Throw me a bone and tell me about it.