The average fuel economy (window-sticker value) of new vehicles sold in the US in October was 24.8 mpg (9.48 l/100 km)—down 0.4 mpg from the value for September, according to the latest monthly report from Dr. Michael Sivak and Brandon Schoettle at University of Michigan Transportation Research Institute (UMTRI). This likely reflects both a continuing increase in the proportion of light trucks sold each month, as well as the recent calculation adjustments for window-sticker values implemented by the EPA for model year 2017, they suggested.
The value for October 2016 is up by 4.7 mpg since October 2007, the first month of their monitoring.
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 0.81 in August 2016, down 0.01 from the value for July 2016 (the lower the value the better). This value indicates that the average new-vehicle driver produced 19% lower emissions in August 2016 than in October 2007, but 3% higher emissions than the record low reached in both August 2014 and August 2015.
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).