The national average price for regular gasoline rose about 15 cents in the last two weeks, according to a survey.

The average price of self-serve regular gasoline on Friday was $3.62 a gallon, up 15 cents from two weeks ago. Mid-grade was at $3.74 and premium was $3.85. That's all according to the Lundberg Survey of 7,000 stations nationwide released Sunday.

Regular gasoline is up 55 cents since 2008 began.

Of the cities surveyed, the cheapest price was in Cheyenne, Wyo., where a gallon of regular cost $3.39, on average. The highest average was in San Francisco at $3.95.

Across California, the statewide average for a gallon of regular was $3.90, mid-grade was at $4.01 and premium at $4.11.