I originally thought about trading my 2012 in on one of the 1500 diesel, upon further research have changed my mind. The towing capacity is less than the hemi and the mpg is only 2 higher than the 2014 hemi. Not worth the extra $$ to me. I will wait a year or two and see what the aftermarket can do with it.
Only 2 mpg higher? The diesel mileage figures have not been released yet but most estimates give it around a 4-5 mpg advantage over the Hemi with 8-speed and a small gain over the Pentastar V6.
Of course, mileage figures are highly influenced by driving style and payload. Also, the diesel and gas engines have different strengths. The diesel's peak torque and hp are at 2000 rpm less than the gassers which makes them much better for hauling loads long distances, not so ideal for unloaded city commuting.
Overall the diesel will certainly use less fuel but the cost savings would probably be small at today's prices. The real reason for buying a diesel has more to do with how we use the truck.