x2 - I get anywhere from low 10's to high 11's according to terrain and such. I also experimented with tow/haul on and off. Tow haul was worth an easy 1mpg.
Your driving methods make a HUGE difference in your mpg. If you are a pedal to the medal keep up with the flow of traffic kind of guy then you will get worse than if you work the hills and such.
I highly recommend tow haul with your ecoboost unless your load is very light.
Keep your speeds under 65 (tires aren't rated for faster than that). Mine gets it's best mpg around 60 mph with my 3:55 gear set.