I have an Edge in my 2001. It might be a little different in gains since yours is a common rail vs my 24v. I usually drive with mine in the mileage setting, as I find the performance settings put out more smoke than the performance benefit. I can get around 20mpg unloaded on the highway in conjunction with 4" exhaust. I like that you can have all the parameters you need, up on the screen. You can set alarms for if any parameters get out of normal conditions too. In tow setting I can tow my 28' holiday trailer (10,000lbs) and get around 12-13mpg.
Good luck with your new truck!