The national average for self-serve regular stood at $3.025 a gallon Friday, up 1.06 cents since July 21, according to the Lundberg Survey of 7,000 gas stations across the country.
The price exceeds the previous high of $3.015 set in July, analyst Trilby Lundberg said.
A gallon of mid-grade gasoline averaged around $3.13, and premium averaged $3.23.
Nationwide, the lowest price for regular was $2.82 a gallon in Charleston, S.C., while the highest — $3.29 a gallon — was in Chicago.
Among California cities surveyed, the lowest price was in Sacramento at about $3.05 a gallon for regular, Lundberg said, while the highest price was $3.24 in San Diego. The state's average fell about 3 cents over the past three weeks to $3.17.