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We took a 2004 Silverado 1500 on vacation in April 2007. 5.3L, 4 speed auto, power everything. Unlike Mythbusters, I know that a lowered tailgate helps. We drove more than 2000 miles at the posted speed limits everywhere we went {except 5 mph slower in the rain on the interstates}. Our trip average was barely over 20 mpg, best tank was a bit over 22 mpg. This was years before I knew what ecomodder was.
I think with a diesel and some mods, it's possible to get around 30 mpg, if you're doing it right. What's right just seems to vary a bit by vehicle, but it always includes lowering your speed, slowing your acceleration, and using your brakes less {by timing traffic lights and not tailgating}. Good luck with your efforts.
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