I have been keeping my speed at no more then 60 and very light on the fuel peddle. I am up to 19. 8 sp far. But It hard to drive like that on the Interstate. Everybody passes me. The automatic Is very nice and I like It so far have not pulled my car trailer yet and that will be the story. I thinking about putting a transmission temp gauge on my truck. If you are pulling I think you need one,otherwise you are guessing and that no good.