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I've got an 03 GMC 5.3L ext cab Z71. 205,000 miles on it. Replaced water pump and both catalytic converters. That is it, since new.

Wife drives an 07 Chevy 5.3L crew cab Z71. 80,000 miles on it. We have put tires on it.

Her's is supposed to have the V4/V8 mode to give better mileage, blah blah blah. Hers gets the same mileage as mine, just right on the nose 16 mpg.

Mine uses absolutely no oil between changes, hers will burn a quart in 3,000 miles. Same as a contractor I use that also has an 07. Same as has been referenced on this forum, and GM just says 'tough'.