The WardsAuto Fuel Economy Index rating for U.S. light vehicle sales reached 25.4 mpg in June, up 1.1% from June 2014. The national average gasoline price was $2.885, 3.0% higher than May, but still 23.4% below June 2014. The market share of hybrids, plug-in hybrids and diesel vehicles were also all down from the same period last year.