If you drive an F-150, you should consider using an "Edge Evolution Programmer"
I bought and installed the programmer about 4 weeks ago. It has improved my performance greatly. The truck runs better and shifts better. I did my first long trip yesterday (150 miles) and I am getting 23.5 miles per gallon now.
My truck is a 1999 F-150 with 5.4 litre v-8 with auto trans. It is the supercab model, with the following modifications. I run 18" wheels,
265/60/18 tires, cat-back flowmaster dual exhaust, and a K&N style cold air intake. And it now does 0-60 in 8.6 seconds. Not bad for a heavy pickup.You can't beat the Programmer for improving the 5.4 litre engine.
Ron in Tampa Bay