^yes but using ford as an example, my n/a 6.2 F250s really got no better mileage than any other small block gasser of years past any brand. But my F150 5.0, similar size and loaded weight as the 250s got easily 3-4 mpg better.
5.0 ecoboost if hey could keep it together, would be an ideal hd pickup gasser I think.
Mo power than the 6.2 when you're hooked up heavy and heading uphill, smaller displacement and better mpgs for the routine daily driver miles that still comprise most of the miles driven even in HD pickups.
