You do know that highway mpg is determined at 55 mph? The guy that posted about his first 1500 posted that he got it to 24.3 mpg. Funny, he had to drive for mileage and not 80 mph to get it.
P.S. I get over the rated mpg's in my 2018 Lariat 2.7 because I know how to drive for mileage.