I rarely exceed 2500 rpm and usually stay below 2200. I accelerate very gradually. I use the cruise control when possible. My driving style is mpg friendly but not so speedy delivery friendly. Even so, I'm never late absent traffic or other uncontrollable events. That said, I filled up in Carnesville, GA at the J. It was maybe 1/3 mile to get on the interstate. I drove mpg fashion to Richburg, SC. It was 159.2 miles to the delivery. My trip computer said 18.7 mpg. It is withing 1/4 mpg when I do the math. I'll double that to half a mpg error. That still means I was getting 18.2 mpg at least and that's with 2006 pounds of freight loaded. That's on gasoline, not diesel. Good mileage can be achieved if you are willing to drive for it rather than the quickest ETA.