I like the tow mirrors but I do not like the larger passenger side mirror being concave. It wasn't concave on my F250. I'd like to replace that larger mirror with the same type as the drivers side.
This has been my biggest adjustment also. I am coming from an F350 and I hate the concave effect on the passenger side. I am relatively new to the Ecoboost; I have had mine since October. I have been very impressed with its ability to tow my toy hauler. My trailer when fully loaded for camping weighs in at about #7300, with about #900 on the tongue. I am right at my GVWR (7700), but about #200 over on my rear axle. I would be okay on the rear axle, but have 2 Great Danes and a fiberglass canopy that add about #450. I have the Tow-max, but not the Max-Cargo package. I have LT tires, and have added Timbrens...don't really know if I needed them but I added them when I bought the truck.
I haven't had any long distance tows, just a few local so I am not really sure about the mileage. My trips have ranged from the 9-14 mpg, and transmission temp has never exceeded 204. One thing that I have added that I never used with the F350 was a friction sway control. I got the bow-wave of larger sized vehicles passing me that I never had with the F350.
I have to say: the Ecoboost pulls the weight of my trailer better than my 6.0 powerstroke did. I don't know what the Ecoboost would feel like towing at its max (#11,200), but it has been very solid for me.