You will love the way that the EcoBoost tows. I've never owned a diesel tow rig, but those who have say that the EB tows a lot like one as far as power and the rpm's it uses.
It does not get noticeably better mpg than my old 5.4 when towing (mid 8's) but it does get LOTS better mpg when not towing. Our TT weighs more than yours, I think (8,500), so your mileage may vary....
We do use premium fuel when towing heavy as the owner's manual suggests.
Glenn and Cheryle- loving retirement
2012 Denali 289RK
2012 F150 4X4 Ecoboost Max Tow