Honda and Chevron helped fund the report. How interesting, my car company and the place I always get my gas... eh... never mind.

I think the problem is to take low-sulfur nationwide. I know that there was a push to bring sulfur-free diesel engines to the US for ultra-clean diesels, but US manufacturers said it would be too expensive to eliminate sulfur in diesels to at most 25 parts per million, despite Europe already selling diesel fuel that is "sulfur-free".