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I have a 01' 5.4L supercrew 2wd with 4.10 gears and a Detroit Truetrac. It made a world of difference for mine, but I 20" wheels on mine. On the interstate I'm turning around 2100 rpm at 70 mph. If you pull anything with overdrive off, you will be turning somewhere over 3000 rpm at 70 mph. As far as gas mileage goes, I get a consistent 15 1/2 mpg. That is about 70% city and 30% highway. Just do it, you won't regret it.
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