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In addition to the factory cover, don’t forget the Avalanche also has a seamless cab to bed transition and I believe it has higher bedsides, but that could just be an illusion.
I put a Backflip full tonneau cover on my 2001 2500HD extended cab short (6.5') bed. With the 8.1L engine, Allison Automatic, 4.10s, 4x4, 285/70R17 Michelin M/S 2 on factory 17” alloys, I can squeak out 14MPG with very conservative mostly highway driving. Previous best prior to tonneau was 13 MPG, but that isn’t A-B-A so take it with a big grain of salt. Around town is 11.
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