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Mike (not verified)    February 11, 2012 - 3:27PM

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Sidney: correct. the Volt runs completely on electricity until 60% of the battery capacity is depleted and then the engine kicks on to run the generator. Once the engine is running, above about 70 MPH the engine engages a planetary gear system to assist the electric motors in driving the car. This system results in a 10-15% increase in efficiency at higher speeds. reference: media.gm.com/content/dam/Media/documents/US/Word/101010_volt_launch/Drive_Unit.doc

(BTW, it takes a while for this document to load. be patient)

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