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2011 edition of EPA Fuel Economy Trends report shows several advanced powertrain technologies making significant gains

Green Car Congress

Since 1975, overall new light-duty vehicle CO 2 emissions have moved through four phases: 1) a rapid decrease from MY 1975 through MY 1981; 2) a slower decrease until reaching a valley in MY 1987; 3) a gradual increase until MY 2004; and 4) a decrease for the seven years beginning in MY 2005, with the largest decrease in MY 2009.