The average fuel economy of new cars sold has increased over the years but not without minor setbacks, and June’s average window sticker was one of them, declining 0.1 mpg to 25.4 mpg.

This tick backwards was documented by researchers Michael Sivak, Ph.D. and Brandon Schoettle of the Sustainable Worldwide Transportation University of Michigan Transportation Research Institute.

Since UMTRI has been tracking average window sticker values in October 2007, EPA-rated fuel economy has increased for new cars sold by 5.3 mpg.

The researchers speculate increased sales of light trucks and SUVs in June are accountable for the mpg decline.

According to the UMTRI’s Eco-Driving Index which estimates average monthly greenhouse gas emissions by an individual U.S. driver, this measure was up from 0.82 in March to 0.85 in April.

The lower the value the better here, so GHG is up a bit as well. Since October 2007, emissions in April were lower by 15 percent but 9 percet higher than in August 2014 which was a record month for these measures.