I read this article from Westways magazine (Sept 2010) it is a AAA publication. It's introducing diesels to the mainstream but warns don't believe what some in the Automotive Press are saying about these new Hybrid Killers. Basically he says diesels are good for MPG but aren't as good as hybrids when it comes to the environment but I disagree.
Cleanliness: I think diesels are cleaner than electric battery cars because of mining the rare earth metals. Plus the article didn't even mention biodiesel. Plus he didn't go into the actual numbers. Check out what this scientist has to say he says diesels are better than gas powered cars. Diesels are getting ultra clean.
Oil imports: Diesel will help reduce our dependence on foreign oil because we will use less fuel.