Nation's Gas Prices Rise Six Cents

U.S. gas prices on average rose about six cents in the last three weeks, according to a national survey released Sunday.

Regular gas prices averaged $3.06 a gallon, mid-grade was $3.17
and premium was $3.29, said oil industry analyst Trilby Lundberg.

The lowest price was in Tucson, Ariz., where a gallon of regular cost $2.80. The highest was in Chicago at $3.46, according to the Lundberg Survey of 7,000 stations nationwide.

In California, the average price for regular was $3.11. The lowest price was in Sacramento at $3.02, while San Francisco had the highest at $3.24.