Real world numbers on the ecoboost aren't that great either. And you're comparing a force inducted v6 vs N/A v8. When you're not WOT or part throttle boosting a turbo charged engine will always perform better. There was times when my 2.0TFSI could crank out 39mpg and other times it could only achieve 19mpg. Forced induction changes the game so much.
When towing, there is little difference between the EcoBoost and the 5.0. But when not towing and driven gently, the EcoBoost seems to do better.
Yes, forced induction does change the game, for the better. I hope Toyota follows suit in the 6th gen. I do like my 4Runner, but when I replace it I hope I can find a truck that gets significantly better mileage.