In its monthly release, the University of Michigan Transportation Research Institute reports that the average fuel economy for light vehicles declined to 25.3 mpg in June, down 0.1 mpg from May.

Overall, fuel economy ratings were down 0.5 mpg from a peak of 25.8 mpg in August 2014 but remain up 5.2 mpg from a low of 20.1 mpg recorded when the institute began monitoring in October 2007.

Michael Sivak, Director of Sustainable Worldwide Transportation at the university, indicates in the release that the decline “likely reflects the increased market share of pickup trucks and SUVs.”

The University of Michigan Eco-Driving Index (EDI) was 0.85 in April, up 0.01 from March 2016. The index estimates the average emissions of greenhouse gases generated by U.S. drivers on a monthly basis.

Overall, the EDI value for April was 15 percent lower than emissions reported in October 2007 but 7 percent higher than record lows reached in August 2014 and August 2015.