More U.S. consumers seem to be buying light trucks rather than passenger vehicles, and that’s skewed the average fuel economy lower, a study found. The University of Michigan’s Transportation Research Institute reported the average fuel economy of new vehicles sold in December was 25 miles per gallon, down about 0.8 percent from November. “This drop likely reflects the increased proportion of light trucks versus passenger cars in the sales mix,” the report read. According to Kelly Blue Book , light trucks took the top three spots in best sellers, with the Ford F-series taking the No. 1 spot and a window-rating of 19 mpg in the city. The Toyota Camry was the top-selling sedan, in at No. 7 on the list and boasting […]