power programmers depending on brand do come with an Eco mode in most cases by reprogramming the trucks computers timing curves it should return some decent results... Just remember that no matter what you do you will not benefit from it the money you invest will take time to recoup ... Your Mom should thank you.
Check out Hypertech Max Energy E-con programmer they make it for all engine options of your Ford 5.4,6.8, and the 7.3L
Performance is our Passion - Hypertech