F150 2.7 Ike Gauntlet

It looks like the 2.7 might average 20mpg, my 5.3 averages 17 and can't touch the 2.7 in performance especially at the altitudes I play in. My only hang up would be the 2.7 vs. the 3.5. If the 2.7 doesn't have a noticeable MPG increase over the 3.5 I just don't see how it would make sense to choose the smaller Ecoboost. Either way, I can't say enough how impressed I am by this thing and man they are good looking trucks.