I got 21.2 on my 2019 Ram Classic Bighorn (3.21) after 120,000 miles, and am currently getting 19.7 on my 22 Laramie Sport (3.92), 28,000 miles so far. I drive 55 miles each way for work (Highway @ 55mph), Cruise Control 99% of the way. These trucks can get good mileage, just have to keep your...