GM Said to Develop Buick Hybrid Using Chevy Volt’s Technology

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General Motors Co. is developing a Buick brand car using the Chevrolet Volt’s plug-in hybrid technology as the automaker expands its line of fuel-efficient vehicles, according to two people familiar with the project.

Designers and engineers are working on a version of the plug-in hybrid Opel Ampera, which was modeled after the Volt and scheduled for sale in Europe this year, with a Buick grille and front-end styling, said the people, who didn’t want to be named because the plans are private. The Buick version would begin sales in 2013 if it gets final approval, the people said.