FILE - In a March 16, 2012 file photo, Delta Brogden pumps gas at a station in Atlanta. Why the seasonal spike in gas prices during spring? It’s the time of year refineries reduce output to repair equipment and start making a cleaner, more expensive blend of gasoline for summer. The average price of gasoline could surpass $4 per gallon nationwide as early as mid-April 2012. Strong global demand, heightened tensions with Iran and a smattering of supply disruptions have kept crude oil prices elevated for months. (AP Photo/David Goldman, File)

Associated Press
FILE - In a March 16, 2012 file photo, Delta Brogden pumps gas at a station in Atlanta. Why the seasonal spike in gas prices during spring? It’s the time of year refineries reduce output to repair equipment and start making a cleaner, more expensive blend of gasoline for summer. The average price of gasoline could surpass $4 per gallon nationwide as early as mid-April 2012. Strong global demand, heightened tensions with Iran and a smattering of supply disruptions have kept crude oil prices elevated for months. (AP Photo/David Goldman, File)
FILE - In a March 16, 2012 file photo, Delta Brogden pumps gas at a station in Atlanta. Why the seasonal spike in gas prices during spring? It’s the time of year refineries reduce output to repair equipment and start making a cleaner, more expensive blend of gasoline for summer. The average price of gasoline could surpass $4 per gallon nationwide as early as mid-April 2012. Strong global demand, heightened tensions with Iran and a smattering of supply disruptions have kept crude oil prices elevated for months. (AP Photo/David Goldman, File)
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