The average fuel economy of U.S. light vehicles sold in May was 25.5 mpg (9.2 L/100 km), the latest WardsAuto Fuel Economy Index indicates, the highest monthly outcome of this year but still 0.2% below like-2015. The price per gallon of gasoline also hit a high point for the year, averaging $2.371 in May. Sales of alternative-power vehicles lost share from April, despite a 7% increase in the cost of fueling a standard gas-powered vehicle. May’s gas price was 15.4% below prior-year, ...

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