The average price for a gallon of regular unleaded gasoline was 26 cents less than a year ago, the report said.
The highest average price in the country was $3.72 in California and the lowest, $2.94, was in Missouri.
The Energy Information Administration, the analytical division of the U.S. Energy Department, said it expected a national average of $3.34 for the rest of the year.
Refiners in the United States produce a winter blend of gasoline starting in September. It's cheaper to produce than the summer blend, which requires extra processing because of environmental regulations.
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