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"   Americans keep on buying more and more efficient cars, at least taken on average. According to transportation expert Michael Sivak at the University of Michigan, all the cars, SUVs, vans, and truck sold in the U.S. last month averaged a fuel economy of 25.2 miles per gallon. That&amp;#039;s the highest number he has recorded, beating the 25.1 mpg for January. For comparison, the number was 20.1 mpg as recently as October 2007.  These are the window-sticker numbers: Sivak uses the combined EPA city/highway mpg rating when making these calculations. He also computes the average for the Corporate Average Fuel Economy (CAFE); for February that number reached 30.9 mpg across the U.S. fleet, also a record.   Lastly, Sivak&amp;#039;s team computes its own metric called the University of Michigan Eco-Driving Index, intended to measure the emissions an individual driver produces by taking into account the fuel economy of their vehicle and how many miles they drove. According to his research, Americans are producing 22 percent fewer emissions per driver when you compare new vehicles we bought in February to the new cars purchased during his baseline month of October 2007. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/a10159/in-february-americans-bought-greener-cars-than-ever-before-16558025/>