Eco-Boost or V8?
The nice thing with the turbos, it does not down shift, but spools up instead. Even large hills, all you hear is the slight wind and away you go.
Just remember, as with all trucks, to make power you will burn fuel. No different here - with the turbos kick in your MPG drops.
Like others have said, if you baby it, you can get great MPG. Mine ranges from 13-24, depending on a lot of variables.
My nephew and brother-in-law have the eco-boost. Both had problems with inclines(loss of power). Had to order new parts for it.
I tend to baby the thing and almost never drive it the speed limit. I find 55 to 60 mph as optimal and wind and load is critical. Normally, most days, I can expect 22-23 mpg on the highway, the way I drive.
Watch out, my truck is black and I tend to drive folks nuts with my slower driving. ChuckC