The national average for self-serve regular was about $2.42 on Sept. 22, down from about $2.65 two weeks earlier, according to the Lundberg Survey of 7,000 gas stations across the country.
Mid-grade prices averaged $2.53 a gallon, while premium cost $2.64.
Gas prices peaked Aug. 11 at $3.02 and have dropped about 60 cents since that time.
The lowest average price in the survey was notched in Des Moines, Iowa — $2.07 a gallon for regular.
The highest was in Honolulu, at $3.03.
Among California cities surveyed, the highest average price for regular was $2.76 a gallon in Los Angeles. The lowest was in Bakersfield, at $2.62 a gallon.
The average for self-serve regular in California was about $2.72, down from $2.92, or 20 cents, from two weeks earlier, the survey found.