Well I give it a try and just couldn't get myself to like the 2008 6.7. The Auto tranny was awsome and well as the exhaust brake but everything else SUCKED!!! Maybe I got a bad one ?

Found a real nice 2007 5.9 3500 4x4 Auto SB CC with 22K and am really happy with it so far.

Now to the mods...What does everyone recommend I do to this one to squeeze fuel mileage and durability out of it?

 

Intake, exhaust, and smarty.

Sent from my Rooted Droid 2.

 

airdog and goerend 48RE wouldn't hurt either

 

Just for mileage? I'd say a cold air intake, intake manifold, turbo-back exhaust, and a good programmer (Smarty for the auto tranny, Hypertech Max Energy for the manual tranny). It's made all the world of difference on my '06. Next, work on a water meth (MPG-Max) and just keep BOMBIN'!