Why? There is no reasoning behind that claim. The EcoBoost offers the best of both worlds; more power, more torque, less weight, and better fuel economy. If you’re getting 11 MPG out of a Gen 2, you must be going WOT stop light to stop light, or someone drilled a hole in your fuel tank. Even in bumper to bumper traffic I’ve never dropped below 15. The 6.2 is old, slow, and heavy. Cylinder count is a ridiculous reason to claim one engine is better than another. If you drove a Gen 1 in the same manner you’d be getting half that number, easily.