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The 5.3 is a tad gutless in such a heavy vehicle. If you get the 3/4 ton model you can get the 8.1L, but then you will be spending all your money on gas.
My parent's came with the dreaded piston slap noise during warm up, but supposedly it does no harm to the engine. Nice vehicle, but after driving it, I would get a 1/2 ton extended cab pickup before I would buy an Avalanche myself. Otherwise no complaints, other than some minor trim details that were covered under warranty.
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