The US EPA released its annual report summarizing key trends in carbon dioxide emissions, fuel economy, and CO2- and fuel economy-related technology for gasoline- and diesel-fueled personal vehicles sold in the United States, from model years (MY) 1975 through 2012. The EPA adjusted fuel economy values are intended to reflect "real world " fuel economy and is based on the values calculated for the fuel economy labels of individual vehicles. Automaker compliance with both CO2 and CAFE standards is based on unadjusted laboratory CO2 and fuel economy values, along with various regulatory incentives and credits. Unadjusted values are about 29% higher than adjusted values.
EPA data for MY 2011 are final while data for MY 2012 are preliminary and based on projected vehicle production values provided to EPA by manufacturers. The fleet-wide average real world MY 2011 personal vehicle CO2 emissions value is 398 g/mi and average fuel economy is 22.4 mpg (10.5 l/100 km), both slightly worse relative to MY 2010. Preliminary projections for MY 2012 are 374 g/mi CO2 emissions and 23.8 mpg (9.9 l/100 km).
NHTSA revised its report on 2012 fuel economy performance for CAFE compliance in February, 2013.
http://www.epa.gov/otaq/fetrends.htm
http://www.nhtsa.gov/staticfiles/rulemaking/pdf/cafe/Oct2012_Summary_Report.pdf
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