The average fuel economy of U.S. new light vehicles sold in December reached 24.9 mpg (9.5 L/100 km), according to the WardsAuto Fuel Economy Index, an 18.8% improvement over the fourth-quarter 2007 baseline and a 2.2% gain on December 2012. The index rating for cars was 29.2 mpg (8.0 L/100 km), up 2.2% from last year. December’s score was down slightly from the previous month as smaller vehicles’ market share declined, despite increasing gasoline prices. Small cars maintained a ...

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