F150 2.7 Ike Gauntlet

And your Dmax has 650 ft lbs. that's the kind of power that could be easily had out of a direct injection turbo V8. And I bet they could get it to drop 4 cyl while cruising then you got your 2.5L engine back for economy.
I'm not a Ford guy but the Eco and the 5.0 hit it out of the park as far as gassers go.