Photo via Wikipedia.

Photo via Wikipedia.

The average EPA-rated fuel economy for new vehicles sold in June fell 0.1 mpg to 25.4 mpg from the May average, according to the University of Michigan’s Transportation Research Institute.

The slight decline reflects "the increased sales of light trucks and SUVs in June," according to the report produced by the institute's Michael Sivak and Brandon Schoettle. Fuel economy is down 0.4 mpg from its peak in August of 2014.

The institute derrives its findings from a combination of light-duty vehicle (cars, SUVs, vans, and pickup trucks) sales and city/highway fuel-economy ratings published in the EPA Fuel Economy Guide.

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 — reached 0.85 in April, up from 0.82 in March. A lower value is better. This value indicates that the average new-vehicle driver produced 15 percent lower emissions in April than in October of 2007.