Originally Posted by LeoCraft
For the 2011+ PSD the 16 mpg average is about right for his mostly in town driving. The 22 mpg claims are what it can do rolling down the highway not towing at about 65-70 mph in good conditions. These trucks get high teens to low 20's at most highway speeds not towing of course. They get low to mid teens around town pending driving conditions/style. Mine has 7,500 miles now and lifetime average mpg is now at 16.5 on computer in mixed driving.
H&S performance, Spartan and Innovative Diesel are the one's I'd recommend talking with about tuning. Innovative Diesel is using SCT products for tuning and they are doing non delete tuning with around 1000 tq and hp over 400 at ground. The feedback on it is positive so far with mild gains in mpg and less frequent regens too. Again that is with all factory emissions systems in place with the Innovative tunes.
IMO if he's averaging 16 in mostly city driving he won't see a ton more no matter what and that's pretty darn good for a vehicle of this size with this power. I think deleting is starting to get old. These engines run so smooth and strong stock and I'm not usually a stock type person.