I got this mileage on one trip, I don't get it all the time. I left from my house in maryland at 3am and drove straight through untill deep in South Carolina then refilled, worked out to 23.84 mpg, have it written down. I stayed at 5mph over the whole way down, speed limits were from 55mph to 70mph, not 70 the whole way down, maybe a third or half way at most. straight down 95 wich is allmost flat for those that don't know that.I do run on Race with the Edge, it is level 4 on it. I fill it up all the way, I know how to burp my truck and I have the weight to move it around. Keep in mind I don't have any fancy grillguards or anything killing my mileage, I have a fold up bed cover on it and I keep the tire inflated to 80psi on rears and 70 psi on fronts,