SHANGHAI, China --- Shanghai General Motors, GM's biggest joint venture in China, unveiled its first China-made hybrid vehicle last week and pledged to deliver GM's E-flex electric drive system and a fuel-cell version of that system to China after 2010, the Detroit Free Press reported. Shanghai GM introduced the Buick LaCrosse Eco-Hybrid in Shanghai and announced plans to introduce three more green vehicles in 2008. The new Buick hybrid promises 15 percent better fuel economy than the standard model, the company said. GM added that the vehicle will be available for sale later this year. The Buick employs a so-called mild hybrid system, similar to the one used in the Chevrolet Malibu Hybrid. GM said one of the new offerings will be a two-mode hybrid that provides 50 percent better fuel economy than a traditional gasoline-burning engine, the Detroit Free Press reported. GM has previously built and sold all its hybrid vehicles in North America. Shanghai GM said that from 2009 to 2012, it will offer 11 engines with improved fuel economy. In addition, the joint venture will introduce GM's E-Flex drive system and fuel cell E-Flex electric drive systems in China after 2010. GM has previously announced plans to produce E-Flex gas-electric plug-in hybrids by the end of 2010 in the U.S.