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AddNext-gen GM 6-speed automatic to boost mileage another 5 percent

It's only been a year since General Motors launched its 6T40 six-speed automatic transmission for mid-size and compact cars. When it was introduced, it brought with it a five percent bump in fuel efficiency. The engineers at GM Powertrain are now developing a second-generation variant of the 6T40 for introduction in 2011 that will bump fuel efficiency by another five percent.

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