No. I have a 2013. 6.7L with 3.42's. Empty I get 22 area at 70-75, if I drive 55 I'll get 25. When pulling my 28ft enclosed with cabinets/insulation/car etc.., around 12k I averaged 13.5 from Mi to Pittsburgh. It'll do a bit better on flatter tows.
The exhaust brake is phenomenal on the new trucks. Also, you use about 1 gal of DEF per 1000 miles at about $6 a gallon. Just an average though.
Good luck.

Also good first hand knowledge here too on 2013+
http://www.cumminsforum.com/forum/2013-general-discussion/

Last edited by 68shifter; 11/09/13 08:11 PM.