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My step father bought an early 2000's Chevy extended cab pickup new with the 4.3l. He put 300k on it before he sold it when he retired. It was already "dropped" from the factory and it had a hard, locking cap on it installed by the dealer. He told me the other day that he averaged 22 mpg over the lifetime of the vehicle. He figured his mileage manually every fillup because he was reimbursed for his mileage from his work.
Of course, he drove the like the grandpa he is, nearly always on the highway with a passenger (or 3, he got paid better to haul his co-workers to job sites). I know he didn't have any mods done, but I could swear that it had electric fans from the factory. Most of his mileage was from long hauls from Michigan to the Carolina's where his rail gang worked.
Knowing that, I think that 25mpg would be doable on the highway with some light tweaking. E-fans, max tire pressure, topper/toneau/etc, and air dam should do it. 30mpg might be possible, but it would almost surely require re-gearing, tune, suspension drop, and some more aero mods.
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