Best magnum MPG?

I just checked my '01 Ram 3/4 ton 2wd. 5.9 auto with 229,*** miles. Got 17.4 mpg going back and forth to work. Went 429 miles and refilled at the exact same pump.

5.2 Durango averaged between 18-20 mpg on a 2000 mile trip last year rolling 70 mph.