phsycle
Adventurer
On Fuelly the 2.7 Eco averages 18.5, so you aren't terribly far off. I average over 16 with my Tundra, but I rarely drive freeways or stop and go city. Outside of a real controlled test, Fuelly data is as good as you'll get (many anecdotes). Speaking of controlled tests, Consumer Reports gets 15 mpg overall for the Tundra, 19 for the 2.7 Eco.
I live in a pretty mountainous terrain so usually MPG is below EPA estimated. But didn’t seem to affect the Ecoboost as much.