drive slower, dont go over 3k getting up to speed and coast to a stop. Thats the easiest...if you wanna spend money, it wont be worth it...youll spend too much to get 1-2 mpg increase...maybe an underdrive pulley would be cheapest mod to start with. Intake/exhaust wont do you any good. If youre stock, then your gearing is ok...you probably have 3.73 on stock tires...regearing would cost atleast 400 and going to 4.10 wouldnt be noticeable and you dont want 4.56 on stock tires. If you have taller tires, go back to stock size.
05 3.0 4dr Edge, Roush signal mirrors, Tremor Sound System, Taurus e-fan, Explorer Sport buckets and console, OHC and lighted visors, Raammat sound deadener and stockinteriors carpet kit.