CM871 low power and fuel economy

[Bengy88]

How many foot lbs of torque was the truck putting down when dynoed? How many rpms was your peak torque and horsepower, what kind of transmission you running? How heavy are your loads? (Yall like pulling heavy heavy shi#t over there)
My recomendation would be to pull or have the file pulled from your engine and have someone good look at it. There are too many people putting 50 cent files in hundred thousand dollar trucks and calling it "tuned" . there is literally another forum (we know where) where you can buy "delete files" for cummins for 150$ for the entire set. This is the shi#t people are putting in ecms and telling people their truck is tuned.... How good do you think those tunes are