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General Motors is releasing a model year update for its Cruze compact sedan. There are no styling changes as the company focused its attention on improving the car’s fuel economy and equipment features.

Thanks to a lower axle ratio for the 2012 models equipped with a six speed automatic transmission, the standard Cruze with the 138HP 1.4-liter turbocharged engine returns 38 mpg compared with 36 mpg for the current model, while the Cruze Eco with the same powetrain setup delivers 39 mpg instead of 37 mpg.

The battle for sales supremacy in the eco-friendly segment between Nissan’s pure electric Leaf and GM’s extended range Chevrolet Volt is really heating up lately, with the two models separated by only 17 cars in U.S. sales figures so far this year.

And while GM is betting on the introduction of a slightly lower priced base model as well as the extended availability of the Volt in all 50 states to win this battle, Nissan is counting on increasing output to ease customer delays after production was disrupted by the Japan’s earthquake and tsunami on March 11.