Quote Originally Posted by Grant H. View Post
No, it doesn't make them more efficient. Sort of apples to oranges, but my Dodge had the DPF/EGR only system, and our Chevy work trucks have the DPF/EGR/DEF system that all new diesels have. The new systems get worse mileage than my Dodge, in factory condition.

The EPA doesn't care about efficiency. They care about exercising their might within their fiefdom.
I think that was the point in the FEE article. Most of the diesel emissions garbage is the EPA enforcing more California nonsense for the purposes of destroying or controlling the diesel industry. All costs in commercial diesel use is passed on to the consumer. Why would the government care about soaking us for money that most of us don't even think about as another hidden tax?