I have a 2014 crew cab Ram 2500 Laramie with the 6.4, 3.73 axle. Previously had a 6.0 diesel XLT with the same axle. The Ram tows my 8-8500 lb TT better. It is quieter and a more relaxing and comfortable ride. Towing I avg 10 mpg. I am in N. California so I have some kind of pass or hill to get over no matter which way I go. I can assault the passes at 55-60 mph, 3rd gear, and ~3000 rpm. I've also taken several long road trips non towing, with about 1000 lbs payload and family of 4 and averaged 18-19 mpg for the entire trip.
2014 Ram 2500 Laramie CC 6.4l Hemi
2011 LaCrosse 296BHS