I asked this question on the Ford forums and the response for the 6.4 Powerstroke wasn't favorable. Will the new 6.7 get 15MPG on a regular basis. When I am pulling a trailer it is only about 2500 lbs., doing P & D. I know I don't need a Cummins for the weight appication. I am trying trying to improve my MPG and lower my cost of ownership over my cuurent 2004 F-150 with the 5.4 gas.

 

Try looking over in the drivetrain forum...should be plenty of info there. Some are starting to see upper teens now that they have over 10k.