Well I had the Diablo Predator but it didn't seem to do anything but make it smoke a little. I bought the EDGE from a RV dealer that swears by them. I mostly use the truck for pulling my 5th wheel around. The mileage issue I'm about ready to give up on, having 4.88 gears there's not much I can do. I really wish I had my old 7.3 back
