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When General Motors shut down Saturn late last year, it lost more than a quarter of its sales of hybrid vehicles. Saturn, with no V-8 models, full-size SUVs or pickups, was GM’s most fuel-efficient brand and was second only to Chevrolet for overall hybrid sales with its Vue and Aura mild-hybrid models. Saturn also planned to launch a new Two-Mode hybrid version of the Vue last year, as well as an advanced plug-in hybrid version, but all those plans went south with the demise of the brand. While there were fears that the technology behind the vehicles would also dissipate, GM exec Tom...