The average fuel economy for light-duty vehicles sold in July remained at 25.4 mpg, which was unchanged from June levels, according to the University of Michigan's Transportation Research Institute.
The flat fuel economy is "consistent with the increased market share of vehicle in the middle of the fuel-economy spectrum (such as crossovers)," according to the report produced by the institute's Michael Sivak and Brandon Schoettle.
The institute analyzes 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 0.82 in May, down from 0.85 in April. A lower value is better. This value indicates that the average new-vehicle driver produced 18 percent lower emissions in May than in October of 2007.