I am a bit surprised that nobody seems to be able to beat the EPA estimates on the 2011+ cars ; it happens all the time with the 2010- cars with the 4.6 engine.
I get around 15.7 MPG, daily driving in mixed Atlanta commuter traffic. I drive fairly aggressively (but play nice), shifting anywhere from 2,500 to 3,000 RPM. Out of curiosity, I spent one week driving like my foot was on eggshells, shifting around 2,000 RPM -- I got 21 MPG in the same commuter traffic. I haven't had it on a highway trip yet, but I would think that beating the EPA rating of 15/26 wouldn't be difficult at all. I had similar results when I had my 2009 Bullitt, and it had a 3:73 as well.