Tabo, if you get 40mpg on the highway, do not change anything on your truck, nothing, not even the trip computer setting. Do you get that mileage on both sides of the mountain or just going down? I average about 20mpg in mixed driving just like Tom is getting, I'm at 53,000 miles. It'll go down to 18 in town and as high as 24 on the highway (level ground). For Timh, there is nothing wrong with your truck. To get 20mpg, you simply need to switch wives. My mileage goes right down to 15 too everytime my wife drives my truck. I guess they really are all from Venus.
