My 2013 5.0 F150 has nearly 9,000 miles on it...stock except for true dual exhaust and an AFE "cold air" intake...intake temperature is exactly where it was with the stock airbox FWIW
The last tank - according to the dashboard, avg fuel econ was 19.2MPG Over the lifetime of the truck it has apperantly been 16.8MPG I filled up 25 minutes ago, I had half a gallon in it, I put 25.0 GAL in, and I had traveled 450 miles on that tank.
So anywhere from 15-20 MPG is to be expected. My boss has a 2013 Ecoboost, he says no matter what he does it won't get any more than about 15.2 MPG
Eco vs. 5.0 is one of those can-o-worms debates the eco guys swear by them though. I prefer a V8, myself.
The 6.2 is going away for 2015...I sure would love a 13-14 XLT with a 6.2-but only for the hell of it, the 3500+ dollar price tag on those tends to steer people away from them.
As for towing, I've never pulled anything simply because the opportunity has yet to present itself. I'm sure the truck would pull damn near anything though.
2015 Mustang GT Premium / Manual / 3.55 / Recaro