The average fuel economy of new vehicles sold in the U.S. in December fell to 25 mpg — down 0.2 mpg from a revised November value, according to Brandon Schoettle and Michael Sivak, researchers from the University of Michigan's Transportation Research Institute (UMTRI).
New-Vehicle Fuel Economy Remains at 25.3
The May value is up 5.2 mpg since October 2007, the first month of monitoring by UMTRI. This value is 0.2 mpg below the peak of 25.5 mpg from August 2014.