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I own a 2007 "Classic", with the 4.8 liter engine. The things that have made a difference to me are:
1. higher tire pressure
2. using a scangauge to get a feel for how to change my driving habits
3. gm switched to pure synthetic oil in the differentials in '06, so you might try that
4. gm switched to electric cooling fans between your truck and mine - try that
5. using a tuner to lower engine idle speed makes a difference
6. using low rolling resistance tires (not LT rated mudders) makes a 1-2 mpg difference
7. lowering your truck would make a difference
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