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I don't agree with the second comment. My mileage is only down 1 or 2 MPG from my 6.0. Any easy trade for me with the improved driveability, quiet and lack of smell.
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Lack of smell wait until your first regen............kidding, but I think the difference between the 6.0 mileage and the 6.4 is going to be somewhat significant long term, 6.4 has more HP, more gizmo's, probably even heavier, though I have not confirmed that...this whole thing is a great irony for me, we clean the air from the foul and evil diesel engine, but we consume tons of more fuel to get there.........so it goes....... /ubbthreads/images/graemlins/confused.gif
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I think the 6.0/6.4 are going to be pretty close. I'm pulling the same loads and trailers on the same roads. You've got to keep your foot out of the 6.4 but it never feels like you're running the snot out of it like the 6.0 and 7.3 did.
The stink, noise, smoke issue had got to be satisfied as it has in Europe. In the states we are at the front end of it as you point out but I do think diesels are a key plank in a sound energy policy. Not sure I can say that about hybrid's by and large. The new Benz CDI's in the ML's get around 25MPG for example in a pretty porky vehicle.
On another note, on the trip I just returned from ULSD was selling for about the same price as regular at about half the stations.