We just bought a 2015 Platinum F 250 with the same engine gears etc. We are getting 13.4 round town. It doesn't move to much going into highway, but we havent done that much yet. I will be adding a K & N air box plus tuning it just like I did to my 2500 Burb. I got an extra 1-2 mpg but ore importantly it towed much better. After all thats why we bought it, not to commute but to tow. Wifey drives it exclusively until towing, thats when I get it :). Havent towed yet but cant wait. I heard that a 4.10 rear was better for pulling but Ill start out with this. My TT loaded should be around 10,000# Hope that helps you. Happy Trails
PS the 6.2 is a gasser with a 6 speed