RAM 2500 6.4 Hemi 3.73 gears, Looking for Opinions

The 6.4 with 3.73 will be great. I have a 2013 2500 Ram 4x4 with the 5.7L Hemi and 3.73 gear and it pulls my 7,000 lb TT great. It will pull it in 5th gear at 65mph and 2,000 rpm. I did a 1,500 mile trip over the summer and averaged 8.5 mpg. I drive about 10 minutes to work everyday or 4.5 miles and 4 stop lights averaging 13-14 mpg. I haven't done any real amount of freeway driving to give you a mpg report.