You're really not going to get much more out of that truck honestly. What's the trans/differential gear ratio? Somewhere along those lines you might be able to pick up a few mpg.
Just make sure you realize how long it'll take you to recoop your money. Even if you go to say, 15mpg with some retardedly long gears, you're gonna save what, $15-$20 a tank? And that's a pretty aggressive estimate all around. It'll take a lot of $15 savings to pay for a new rear gear set or trans.
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