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I assume your truck has the 5.4L, 2 valve head? My Dad has pretty much the same truck and I've only driven it a couple times using my scangauge so I can't say I know how to drive it perfectly for mileage. The 5.4L with the 3 valve head is about 20% better for mileage. Maybe you can trade in your truck for a 2wd 3 valve, with a manual transmission?
In any case, first I would get a scangauge, then you can tell if what you are doing is helping. Things like coasting in neutral show up instantly on the gauge so you are inclined to do it more. You'll also see how important it is to get into OD with the torque converter locked quickly, accelerating slowly for a mile before you get into OD will use more gas than getting up to speed in a 1/2 mile.
Ian
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