What is the four mode hybrid system GM is working on?

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    At this point it’s pretty unclear what this means. GM officials have been saying that the next generation GM hybrid, expected to be released in 2013, will be four mode verse the current two mode. With two mode that is “a pair of planetary gear sets” that make it possible to run both gas and electric in unison to make the car more efficient. Making the truck four mode is expected to give the vehicle more power, with the towing capacity going from 6,000 pounds to at least 9,000 pounds. It is unclear though what the two extra modes will be.

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