EPA Report: Initial Data Shows Significant Gains in Fuel Economy for 2012.

The expected 1.4 mpg improvement in 2012 is based on sales estimates provided to EPA by automakers. EPA's projections show a reduction in CO2 emissions to 374 grams per mile and an increase in average fuel economy to 23.8 mpg. These numbers represent the largest annual improvements since EPA began reporting on fuel economy.

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