Right now I drive a Volvo 850 and get low to mid-20s MPG. I plan to make my next car a hybrid, possibly the Toyota Prius if I can live with the seats (I have a bad back, so that is a touchy issue for me, no pun intended). I am assuming that it is environmentally wiser to drive my car into the ground then buy a new hybrid. If I sell the Volvo and buy a hybrid now, someone else will just be driving the Volvo, and the enviromental cost of making the new car that I would buy I assume offsets the benefit of my driving a hybrid. Am I missing anything?