What Would Jesus Drive?

I saw this bumper sticker on a car today, and I thought it was a joke. In fact, it is not a joke. It is a group of Christians who think that environmental issues are important, and that choosing (for instance) a fuel efficient vehicle is a moral choice. They also think that the United States should be a world leader in environmentalism, and that the McCain-Lieberman Climate Stewardship Act is a very good idea. I haven’t read enough of their material to really endorse their position, but so far so good. What would Jesus drive?