As you all know I just got a 3.5L Ecoboost F150. It's a 2012 FX4 Supercrew with 3.73 gears. I have put 3000 miles on it and so far towed a little over 10,000# 1,200 miles. It's turned in 18% better fuel economy towing than the truck it replaced, a 2008 Nissan Titan.
18% may not sound like a lot but it adds up at the gas pump. In addition to better economy the power is unbelievable. This is my 27th vehicle and while the Titan was the best gas vehicle for towing I have owned till this Ecoboost, there is simply no comparison. It feels as strong on the road as my 99 7.3L Power Stroke F350 and I am quite sure it would out accelerate it and pull grades better.
As for winding up the motor, that's simply not true. It will cruise down the highway at 2000 rpm running 70 plus or pull my 10,000# plus load with the bed full and 4 of us in the cab through out the hills of Kentucky and Tennessee and never broke 3500 rpm even from a dead stop.
As for day to day driving I am seeing 19mpg. My commute back and forth to work, 118 miles, yields 21.3 at 70 plus mph.
My guess is the new 2.7 will work just as well but yield 25 plus mpg.
Chris