Simple economics Rob.....as the cost of fuel goes up, up, up, people will drive less, less, less, until a little bulb in their head goes off, and they decide to sell the full size truck, or SUV they have been using for a commuteing vehicle, and switch to a smaller vehicle form of transport. As a country, we could most likely use about half the fuel we are now burning for just commuteing to, and from work, and also for running errands. Wait till the cost of a gallon of diesel goes to $6 a gallon. We'll finally see a real shift to smaller autos, like back in the late 70's, and early 80's. Some never had the choice, and have been in small commuter cars all along. It's all so very simple, I'm surprised at people's thought processes. We have been on a glut party of oil for decades, and it has been great, but now it is over for now. Tougher decisions are ahead for all of us.