The average fuel economy of new cars and light trucks sold within the United States in August was 25.3 mpg, down a very modest 0.1 mpg from July. Based on data plotted by the University of Michigan Transportation Research Institute, that represents an overall increase for the summer months — though it’s been a few years since we’ve seen a meaningful net gain.

Peak efficiency occurred in August of 2014, when fuel economy averaged 25.5 mpg. Since then, it’s been a herky-jerky series of minor rises and falls — ultimately resulting in an annual stagnation. Lower gas prices, combined with a growing preference for crossovers and SUVs, has kept the yearly economy average at 25.1 mpg.  (Read More…)