Several folks in the general area bought up VW Jettas a bit over a year ago when a VW dealer got several demo cars in. The folks I know are reporting from 42-54mpg. The only problem has been with a few quality control issues with the car itself (not the engine/tranny).
Better than a Hybrid, with no batteries.
I would like about a 4 liter, 6 cylinder turbo Diesel in a 1/2 ton pickup with a programmable power module (a Bully Dog or the like) on the dash. You can dial in for economy for cruising. I bet you could get 30MPG. Or, you can turn the wick up to embarrass the gassers. Add a little NOS if you really want to motor.