The average price of regular gasoline at U.S. filling stations declined 15 cents in the past two weeks to $3.48 a gallon, according to Lundberg Survey Inc.

The survey covers the period ended June 22 and is based on information received from about 2,500 stations by the Camarillo, California-based company. The price is down 49 cents from the highest average this year, during the two weeks ended April 6.