According to the University of Michigan Transportation Research Institute, the average fuel economy of new vehicles based on their window sticker values hit 25.2 mpg in March, an increase of 0.1 mpg over February.
Overall, fuel economy ratings remained down 0.3 mpg from a peak of 25.5 mpg in August 2014 and up 5.1 mpg from a low of 20.1 mpg recorded when monitoring began in October 2007.
The University of Michigan Eco-Driving Index (EDI) was 0.84 in January, up 0.01 from December. 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 16% lower emissions in December compared to October 2007, but 6% more than a record low last reached in November 2013.