2015 F150 EPA Rating

I'm very gullible. My 5.4L F250 "can" get the 14mpg city and 17mpg highway that the 5.4L F150 was rated for if I drive it like it has wet brakes. It can be done. My Prius work truck returns it's EPA rated 52mpg city and falls shy of it's 48mpg EPA rating by 1~mpg as I like to drive 72-74mph to keep from getting run over by the majority of traffic. Previous vehicles have been pretty close to their rated MPG as well. One of my co-workers drives like he's stomping grapes even when a steady cruise would be nice and doesn't believe any vehicle can achieve it's EPA rated fuel mileage. He's probably concluded he's not gullible.:B