Analyst Trilby Lundberg says the average price of regular gasoline was $2.49 a gallon Friday, when the survey was completed.
That's up 54 cents from ten weeks ago, with most of the rise occurring during May.
The average price for a gallon of mid-grade was $2.62. Premium was at $2.73.
Tucson had the country's lowest price - $2.22 for a gallon of regular. The highest was in Chicago, at $2.76.
The lowest price in California was $2.65 a gallon in Fresno and Bakersfield, and the highest was $2.72 in San Francisco.
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