I run 2,000 at 66 MPH, 2,500 RPM at 80 MPH. Still pulling good 21 MPG empty.
245/75 R16 tires which are 30.5 inch tires and produce final ratio of 3.69:1 to the ground with 3.55 gears. Still even on my camping trip I laid into the power a bit too much and the rear tires came to life with more blue smoke (tire spun loose). Then I'm heading for Lake Fork Idaho tomorrow and moving my best friend from Lake Fork to Donnelly Idaho. This combo has be a towing dream and quick for power, I can get to highway speeds really easy with out a huge amount of EGT's. Yeah I could stomp it to the floor and run the pyrometer up as high as I want but I don't need WOT to get a 8,000 pound RV rolling and 8,000 pound truck moving too.