[MarkoPolo]

I would agree with Tim, although I have been getting 1 to 1.5 better mpg....some of the time. Other times, it's close to Tim's numbers. I do think in a best case scenario, I would get about 20 mpg in flat, non windy conditions and 17 or 18 pulling the TM. I'm happy enough with what I do get......last fall drove to Bryce Canyon and back with about 70% pulling the TM and got 17.5 mpg.
I was sort of set against the Eco-Boost due to some negative internet chatter, but I couldn't be happier. I can't believe the power that thing has when you need it!