The average U.S. price of regular-grade gasoline shot up 16 cents a gallon (3.8 liters) over the past two weeks, to $2.66.
Industry analyst Trilby Lundberg of the Lundberg Survey says the rise comes as supplies tighten while refineries undergo maintenance in advance of increased demand during the summer driving season.
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Lundberg says Sunday that the current retail price is the same as it was a year ago.
The highest average price in the nation is $3.48 a gallon in the San Francisco Bay Area.
The lowest average is $2.29 in Baton Rouge, Louisiana.
The average price of diesel rose 3 cents over the past two weeks, to $3.08.
