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I'll add a few additional mods to the list that aardvarcus proposed.
1. Assuming that you have steel wheels, switch to stock aluminum wheels of the same size. Craigslist in my area is full of takeoffs that can be had fairly cheap. I did this with my 2007 Silverado Classic and dropped 7 pounds of unsprung weight off of each wheel.
2. In later years (I think starting in 2006) electrical cooling fans replaced engine driven fans in the Silverado lineup. Swapping your clutch and fan assembly for an electric fan would give you another little boost in MPG.
3. Aluminum drive shafts were used in some configurations of the GMT800 chassis. If yours is steel, swapping it out should remove roughly 25 pounds of rotating mass from your drive line.
Used parts are available for all of these things, and obviously they work as GM included the features in later GMT800 models of the Silverado.
Lastly, I'm a really big proponent of using a Scangauge to learn how your vehicle responds to various driving styles and mods. The biggest single thing that I ever did to improve my mileage, was to learn to stay out of the throttle in my Silverado.
Enjoy your truck!
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