Photo via EveryCarListed/Flickr.

Photo via EveryCarListed/Flickr.

The average fuel economy of new vehicles sold in August decreased by 0.1 mpg to 25.3 mpg from July, according to Brandon Schoettle and Michael Sivak, researchers from the University of Michigan's Transportation Research Institute (UMTRI).

The value for August is up 5.2 mpg since October of 2007, the beginning of monitoring, but still down 0.2 mpg from the peak of 25.5 mpg reached in August of 2014, according to the UMTRI report.

The University of Michigan Eco-Driving Index (EDI) — an index that estimates the average monthly emissions of greenhouse gases generated by an individual U.S. driver — worsened to 0.83 in June, up from 0.82 in May (the lower the value, the better).

The EDI indicates that the average new-vehicle driver produced 17% lower emissions in June than in October of 2007, but 5% higher emissions than the record low reached in November of 2013.