My buddy in West Va just got a new 1500 4x4 quad hemi, replaced his 1st gen CTD, he didn't need the towing capacity of the Cummins anymore, and could not justify the extra $$$. He took a road trip in his new truck thru the west VA mountains and got a calculated 16. 5 mpg.
He test drove 1/2 ton v8 gassers from Ford and Chevy & told me it was absolutely no comparison powerwise, says the hemi had it all over the others - this is all hearsay, but this guy is a real straight shooter, so I tend to believe him.