The average fuel economy of vehicles purchased in September was 22.1 mpg, unchanged from August.

According to UMTRI research professor Michael Sivak, head of UMTRI's Human Factors Group, average fuel economy of all new vehicles bought last month is at its lowest level in the past year. In fact, average fuel economy for new vehicle purchases has trended downward since it hit a high of 23.0 mpg last March.