[cleanspeed1]

Get rid of the full size pickup and get a Ranger with a 4 banger. Unless you're ok with putting loads of cash into a truck to make marginal gains for the thrill of it, switching to a smaller vehicle as a primary will make better economic sense.

But if you insist on modding the big gasser, here's a start.

Convert the speed density system over to mass air. That change alone will pick up 2-4 mpg. Kits are available through Ford Motorsport.

Give dpTuner a call for a custom programming if you want to keep the speed density system.

Full tune up.

Check to make sure that the emission controls are functioning properly and that the catalytic convertor (s) are not plugged up.

Put a Scangauge or other similiar device and learn how to drive by it.

Change your driving style; that's going to be the biggest thing that affects mpg.

Look at the efficiency and hypermiling tips and use them.