What I was looking for was the axle ratio info. I know that Chevy has a high milage 5.3 package just for the EPA tests but I wasn't aware that Ford did the same with the echoboost
Chevy will combine the 5.3 with the 6 speed and a 3.08
vs
Ford will combine the 3.5tt with the 6 speed and 3.15.
Those are also both 2WD standard cab trucks.
To get those drivetrain combinations costs$. Chevy charges $2K for the 6 speed, Ford $2k for the 3.5tt. For a one to two mpg difference, that could take you several years to recoupt the initial cost.