A hybrid diesel truck...

Long Island - Newsday (http://www.newsday.com/blogs/long-island/huntington-local-1.812006/hybrid-street-lighting-truck-in-huntington-1.1384506)

It's a shame diesel doesn't catch on. It is much cleaner and quieter that it was 20 years ago. It is not uncommon for the Mercedes diesels to beat the gas hybrids in mpg tests. They ususally go over 50mpg. Couple the diesels with biodiesel and you have an awsome combo.