The biggest change I know of, is now a 4 yr 50,000 mile warranty like the H1 and H3. As far as the displacement on demand thing goes, they are offering that in some GMC's, but it is not getting thrown into a Hummer yet. It's very neat in theory, and seems to be working well out in the field, with no problems yet. My personal opinion, is that it is a lot of potential for future problems for a 7% increase in fuel mileage.
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