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$15000 for a 30mpg truck is excessive IMO when it could probably break into the mid/high twenties for ten times less. Going back to 1985, the F-150 w/ the 300 was rated at 24mpg highway and the F-250 w/ the same engine was rated at 19mpg highway. What was the difference? The transmission and overall gearing. Keep in mind, these EPA figures were adjusted versions of the original test, so at a ~50mph cruise, a 85 F-150 probably pulled closer to ~28mpg. In 91, both the F-150 and F-250 were rated for the same mileage, probably because gas was cheap and people cared more about acceleration than they cared about fuel economy. Odds are taller gearing ala the 85 F-150, and maybe aeromods if drafting showed an improvement, are the cheapest/easiest way to bump up in the mileage near the mid twenties provided the truck is in working order.
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