Thats why I bought the 5.0, best of both worlds. I can drive it (not baby) and it gets better mpg than the Eco

 

The insurance company rented a 2013 4x4 superduty with the 6.2 after a semi rear ended my supercharged 150. I had to tow a 14' enclosed two axle trailer 1800 miles with it. I started with 6 miles on the clock (brand new). It ran 70 on interstate 95 all the way then a bunch of around town (still towing) and averaged almost 11 MPG. The trailer was never unhooked. It stayed in OD most of the way and I liked the 6 speed. I thought that was pretty good. My 5.4 does around 10 with the same trailer and load. Just for S&G I reset the MPG and it got over 15 on the way back to Enterprise bobtail. Oh, and it did sound pretty good!
The wife has an MKS with the eco boost. Darn thing is wicked fast for what it is!
It would be a hard decision for me. Good Luck!