I would look for a 2018 or newer RAM 6.4L Hemi. That is the the first year for the 8 speed auto trans. I have a 2017 6.4L, 6 speed with 4:10 axles and it get 1 mpg less than the Diesels. Diesel is great if you need it. I don't purchase for the 1% use.
BS, you won't get within 5 mpg of my deleted 2013 Ram 3500 4x4 with 300k on the odometer. My advice is, don't buy a newer diesel truck unless your prepared to trade before the warranty is up, or you completely delete the emission BS. IMO, the best diesel trucks ever made are the Ford 2005 - 2007 once you delete and bullet proof them.
