Now that Ford will no longer offer a 6.2L in the F150, how about a 4L Ecoboost V8 as the top tier medium duty engine and a base heavy duty engine for the F250?
Extrapolating from the 3.5L Ecoboost you get:
-417hp -480lb-ft -20% better fuel than the 6.2L it replaces and 10% better fuel than the N/A 5.0L -Commands a premium over the 3.5L. -More compact than the 6.2L so you can use it for RWD car applications like the Mustang or a Lincoln sedan