In its monthly release, the University of Michigan Transportation Research Institute reports that the average fuel economy for light vehicles increased to 25.4 mpg in July, up 0.1 mpg from June.
Overall, fuel economy ratings were down 0.4 mpg from a peak of 25.8 mpg in August 2014 but remain up 5.3 mpg from a low of 20.1 mpg recorded when the institute began monitoring in October 2007.
The University of Michigan Eco-Driving Index (EDI) was 0.82 in May, down 0.03 from April 2016. The index estimates the average emissions of greenhouse gases generated by U.S. drivers on a monthly basis.
Overall, the EDI value for May was 18 percent lower than emissions reported in October 2007 but 4 percent higher than record lows reached in August 2014 and August 2015.