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Well, the GMT-400s had a 10 year model run, and the GMT-800s had a 7 year run, so it's not that unreasonable with a couple of re-freshes for the GMT-900s to go 6-7 years.
Not only that, the Duramax 4500 is coming in 2010, and that's supposed to get about 19 city/26 highway. I think those things will sell like gangbusters. Especially if they have a full 10,000 lb. towing capacity, unlike the hybrids, that max out at 6,000.
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