According to the University of Michigan Transportation Research Institute, the average fuel economy of new vehicles based on their window sticker values was 25.1 mpg in January, up 0.1 mpg from the revised rating in December. The institute considers the change to be due in large part to the increased price of gasoline during the month.
Overall, fuel economy ratings were down 0.4 mpg from a peak of 25.5 mpg in August 2014 but remain up 5.0 mpg from a low of 20.1 mpg recorded when monitoring began in October 2007.
The University of Michigan Eco-Driving Index (EDI) was 0.83 in November, unchanged from October. The index estimates the average amount of greenhouse gas emissions generated by U.S. drivers on a monthly basis.
Taking into account a combination of fuel economy and driving distance, the EDI value indicates that on average, new-vehicle drivers produced 17% lower emissions in November compared to October 2007, but 5% more greenhouse gases than a record low last reached in November 2013.