Diesel: Mercedes asks if it’s worth the effort, Audi sticks with it for U.S.

2016 Mercedes-Benz C450 AMG SportThe ongoing Volkswagen diesel scandal continues to affect the U.S. market for diesel cars in a negative way. Diesels have never been as popular in the U.S. as they are in Europe, and models on offer have typically been limited to VW Group brands and a smattering of other German makers. No VW Group brand is currently selling diesels in the U.S...