A survey says the national average price for gasoline rose 7 cents over the last two weeks.

The average price of self-serve regular gasoline on Friday was $3.26 a gallon, mid-grade was $3.38 and premium was $3.50. That’s all according to the Lundberg Survey of 7,000 stations nationwide released Sunday.

Of the cities surveyed, the cheapest price was in Newark, N.J., where a gallon of regular cost $3.03, on average. The highest average price was in San Francisco at $3.66.

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On the Net:

Lundberg Survey: http://www.lundbergsurvey.com