Even detuned, to say, 400 horsepower and 450 torque for the F53 and E450, it should be a significant boost over the 6.8 V10. Being overhead valve, it shouldn't rev as high to climb the grades. Therefore less noise up front.
I doubt MPG's get better though.
I'm encouraged that they tested "hundreds" of these engines. I wouldn't normally, but now I do see myself buying a first year engine.
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