I averaged right around 13 mpg with my 2015 in regular mixed driving and the 3.92. I never understood where they got their numbers but yours sounds very respectable. The website Fuelly has some data and my old 2015 Outdoorsman fits with that. https://www.fuelly.com/car/ram/1500?engineconfig_id=19&bodytype_id=14&submodel_id=2369
I wish they had a breakdown for different rear ends but no so you get the mix. I appear to be getting the "average" with my new one and the 3.21's now that it is broken in https://www.fuelly.com/car/ram/1500?engineconfig_id=19&bodytype_id=14&submodel_id=1979. The first 1300 miles resembled my old Outdoorsman but after my first tow and now a couple weeks in it appears to be up toward 16 mpg using 90 octane. That's still a respectable increase over my old Outdoorsman.
