The US conventional wisdom is that diesels are big, very dirty truck engines. The small turbodiesel is not a thing that made much headway here outside of a sma

The US conventional wisdom is that diesels are big, very dirty truck engines. The small turbodiesel is not a thing that made much headway here outside of a small segment of VW's itself smallish customer base. 18-wheel big rigs, trash trucks, school buses, and passenger busses, on the other hand, are ubiquitous - and emissions on them only minimally regulated until recently. Most people wouldn't know anything about air filters on diesel engines, much less adjust consumer behavior to compensate. There's also this: http://www.businessinsider.com/why-diesel-costs-more-than-gasoline-2013-10 http://www.businessinsider.com/why-diesel-costs-more-than-ga...