If I had the money, I would buy a hyrbid car. I really like the Toyota Prius. The Honda Insight is ok, but a little too sporty for my taste. Then there is the EV1 by GM (by way of Saturn). However, that is entirely electric and needs to be plugged in. Not teribbly practical yet, especially outside of California.
At the moment, however, I drive a 12 year old Cougar and am happy if I only have to fill up once a week.
