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My father has a standard cab heritage f150 (2004 with 2003 styling). When I've used it I notice that it is very sensitive to speed. Keep it around 60mph and mileage is dramatically better. I got almost 18 (17.8) pulling an open trailer over a 100 mile trip with this technique. At the time the truck had no aero improvers i.e. tonneau cover. The 4.6 isn't an ideal economy motor, but can be coaxed into fairly efficient operation. A scanguage would be almost a necessity to get best results in my opinion.
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