 I have now had my tdi one year and 35,000 miles.  Still drives like new.  I do a lot of highway driving and it is too easy to drive way over the speed limit (85-90) while still getting 35-37 mpg.  Queen size air mattress fits in back for the dog.  No downshifts required when driving up 6% grade mountain highways.  Torque just flattens out the mountain.  Driven very conservatively, I have nearly hit 700 miles to a single tank of diesel.