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.
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.