The ecoboost is the 3.5 l turbo.
My 2013 truck has the 3.7 l flexfuel non aspirated engine. With 3.73 gears and 6r80 trans I bet it would tow 2 1/2 tons easily, that isn't much compared to what the 3.5 l turbo, 5.0 l or the 6.2 l can tow. Yet that 3.7 l puts out more horsepower at higher rpms than my the old 351 windsor with a four barrel. And I believe that's the trick to the 3.7 l. When you need power, it's there and you're not wanting for the lack of, in that if you really need to hit the gas petal it will drop a gear, shoot the rpms up and the next thing you know that v6 engine is putting out 300 horsepower.
If it ain't aspirated, it ain't running.
Naturally aspirated? (No turbo, blower, supercharger)
