[PaleMelanesian]

It takes fuel to make power. What these downsized-and-turbo engines give you is the option to choose how much power you want. Along with that comes the ability to choose fuel consumption. Drive lightly and they'll reward you. Drive with a heavy foot and you'll get the mileage to match.

In the F150 Ecoboost comparison, you have to consider that the V6 turbo is capable of more power and torque than the V8. If you actually use that power, you'll necessarily consume more fuel as well. The beauty of it is, if/when you don't use it, you save fuel compared to loafing along with the bigger engine.