Diesel is attempting a comeback in the U.S. now that clean-diesel technology has proved viable — and it’s come at a time when everyone is eyeballing the mpg rating on a car’s sticker. Yes, diesel-fuel chugging Volkswagen Jetta TDIs get considerably better mileage than their plain-Jane gasoline counterparts, but they also tend to cost more. Are there other disadvantages to owning a diesel car? Although he’s already taken on the wagon version of the Jetta, Joe Wiesenfelder takes you through his thought process when it comes to driving the 2009 Jetta TDI. Click below to read his full review.