The average fuel economy (window-sticker value) of new vehicles sold in the US in March 2016 was 25.3 mpg (9.29 l/100km)—unchanged from the revised value for February 2016, according to the latest monthly report from Dr. Michael Sivak and Brandon Schoettle at the University of Michigan Transportation Research Institute (UMTRI). Fuel economy is down 0.5 mpg from the peak reached in August 2014, but still up 5.2 mpg since October 2007.
The University of Michigan Eco-Driving Index (EDI)—an index that estimates the average monthly emissions of greenhouse gases generated by an individual US driver—was 0.84 in January 2016, up 0.01 from the revised value for December 2015 (the lower the value the better). This value indicates that the average new-vehicle driver produced 16% lower emissions in January 2016 than in October 2007, but 6% higher emissions than the record low reached in August 2014.
The EDI takes into account both vehicle fuel economy and distance driven (the latter relying on data that are published with a two-month lag).