IME it all depends on the individual truck. Some trucks just get better mileage than another identical truck. My buddy has a new Limited and he never gets over 17 on the highway. Same motor, same gearing as mine. I have taller tires and I never get less than 17 on the highway regularly averaging 19 on a road trip. I’m just glad that mine is a good one. I do believe they have some pretty false MPG advertising on the stickers but not much a guy can do. Nothing worse than walking into a dealership service dept and complaining about fuel mileage in a pick up, lots of eye roll!