LIVONIA, MI – As it gets tougher to wring out efficiency gains from powertrains, General Motors Corp. is putting more focus on making vehicles lighter in order to improve fuel economy, a company executive tells the 23rd annual Automotive Aluminum Design and Fabrication Seminar here. "There is no question," says Alan Taub, GM executive director-science, "continued improvement in fuel economy is going to require light-weighting action." Auto industry use of aluminum, along with plastics ...

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