Technological innovation is a major driving force behind the recent improvements in CO2 emissions and fuel economy, and the majority of the carbon and oil savings from current vehicles is due to new gasoline vehicle technologies, EPA said. … EPA suggests that three factors are at work: 1) MY 2009 was a particularly unusual year due to the serious economic recession that almost certainly led to an artificially low truck production share in that year, which then results … …

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Green Car Congress: EPA annual report on CO2, fuel economy and …