I’ve had my Jetta TDI wagon for over a year now, and average between 35-38 mpg, average driving. I haven’t had any long trips, really, so I don’t know about straight highway driving. So far, it’s been a good car. The salesman said it could last me the rest of my life. I kind of laughed when he said that, because of my condition. Still, it would be nice to outlast my car! These diesel engines are capable of 300k miles. I wish someone could tell me why diesel fuel costs more than gasoline, considering it requires less refinement. It used to be much cheaper! In an emergency, I was told, one can put kerosene in a diesel car. I would be certain that was no myth before I ever tried it.