I am getting a combined rating of 11.1 L/100km (21.19mpg) right now in my edge. It is quite literally 50/50 driving so I am pretty impressed. I should mention we are in the middle of winter right now, so this has gone up vs. the summer months. Keep this in mind too if you live in colder climates that your economy will go down. Denser air will require more fuel. I am not easy on the car at all. Here is why...
We drive a turbo 4. The turbo is on the SUV because the motor would be under powered without it. Therefore you want this thing to be spooling when you are accelerating both from a stop and a roll. By babying the vehicle and trying to not make it spool or boost very little, you are making the N/A aspect of the motor work that much more. Once a vehicle is up to speed its is much easier to keep at that speed then to accelerate to it. Trust me, accelerate as quickly and safely as possible to your desired speed then coast from there, but do not baby it to your desired speed.
Give it a shot and let me know your results. I hope this works for some of you, as I am seeing lots of "I baby my vehicles"
As for guys talking about tuned vehicles. You should know better than anyone else that a properly tuned factory car will always get better mileage then without the tune. That is what a tune does. Gives you a better burn of unused fuel from a factory tune. You should always see increased power and fuel economy from a tune. If you don't, return your tuner.
With that being said, it may be wise for lots of ecoboost owners to petition SCT to get our vehicle supported for tuning. The tuner will work for our vehicles but they have no canned tunes meaning you would need to find a local tuner currently. They just finished up with the 2.0L in the focus with good gains. I have sent my opinions to them, I would suggest you do the same.