No argument: The EcoBoost will get better "mileage" at idle in the driveway.
Cruising down the highway should be much better? It remains to be seen, of course. There is no rational comparison between an EcoBoost in a 1.5 ton street only SUV and the same power plant in a Raptor. How a twin-blower V6 performs in a nearly 3 ton off-road truck is a question that has yet to be answered.
So since I have owned a 6.2 in a non-Raptor for several years, I can tell you that it isn't any better, and most of you guys get better MPG than me. So, comparing the gen1 eco in a non Raptor to the 6.2 in a non Raptor should help tell the tale for gen2 vs the same. It has MPFI and DI to maximize performance AND efficiency - a first EVER, and the 10 speed, stop/start tech, and lighter weight. It's going to be a bit before there is conclusive evidence to support either side of the argument. I'm simply stating that every factor that attributes to MPG is in the gen2s favor.
Also, nobody said "mileage"... but it's winter in most of the country so most of us looking at our dummy MPG meter in the dash are seeing significantly lower readings there because the truck sits idle much more than the rest of the year.
I'm not an Ecoboost fan boy at all, driving a 6.2 and loving it, but I don't see why the gen2 wouldn't outshine the gen1 in every measurable capacity (other than exhaust note which is subjective)... unless Ford decided to go backwards for the gen2.
And sorry if my comments are coming off argumentative, not my intent, just trying to convince myself I need a $70k truck in my driveway like most of you guys. If it gets 20% better mpg, that's $100/mo in fuel savings.