2020 1500 LT, crew cab, 4x4, 3.0 I6 diesel, 10 speed with 3.73 final. I’ve averaged high as 25 to 27 MPG unloaded when driving on the interstate. Around 16 to 18 city driving. I bought this truck specifically for pulling a travel trailer. Loaded, the trailer weighs close to 5,800 lbs. I carry an additional 200 or so pounds of camping gear in the truck bed. Our longest trip pulling the trailer has been a little over 120 miles resulting in 13.2 MPG. On this trip I intentionally kept speed under 65 MPH. We have gotten as little as 11.5 MPG while driving 65 to 70 MPH on the interstate. Terrain that we travel, interstate and city, is mostly rolling hills and valleys with a lot of steep grades. I’m very pleased with the trucks power and fuel performance.