When I first began talking with Audi about road-testing the company's new Q7 TDI clean diesel SUV on Road Trip 2009, I have to admit that I was more than a little bit suspicious of that term.
"Clean diesel." It sounded a lot like another new term of art, "clean coal," and I think we know pretty well that there really isn't much that's clean about coal. Plus, I think many of us have negative associations with diesel, a technology long known for sooty fumes, loud engines, and a whole lot of pollution. … Read more