Go on youtube and look at the towing videos. 10,000 pounds hooked to the back of an Ecoboost and a 6.2 Chevy. The Eco beats the Chevy to the Eisenhower tunnel by 1 1/2 minutes; that's forever.
Eco is better at altitude. It also has more torque production at low RPM. The big V8's have impressive numbers but they are all at 4,500 RPM.
2012 Race Red FX4 Ecoboost
Luxury Pkg, Max Tow Pkg
Retrax Pro, Black Luverne Nerfs
Amp Research Step