Although not given the name, it does look like a BMW E70 to me from the back. Picture on page 38 of the entire study performed by Univeristy of West Virginia on behalf of ICCT :

http://www.theicct.org/sites/default...al_may2014.pdf

Altough I'm not questioning the findings of the investigation, it makes me wonder how and why were these cars chosen for the study and not others/or more, as there are other diesels on the US market