I took the family to San Antonio Texas this past weekend for a college visit for my son at Trinity University. The Louisiana speed limit on the interstate is 95% 70mph from where we entered the interstate just west of New Orleans all the way to the Texas state line. I hit the Texas state line with a 19mpg avg. On the way back coming through Texas speed limits were as high as 75mph but did a lot more fluctuating (60-75) than it does in Louisiana. I hit the Louisiana state line with an 18mpg avg. We are a family of four and we packed light. I was surprised that my economy was 18mpg on the Texas side, I thought it would have dropped lower. I very satisfied with the way the truck handled the trip and the fuel economy was IMO decent.