Diesel held steady at $3.93 gallon.
Of the cities surveyed in the lower 48 states, Tucson, Ariz., has the nation's lowest average price for gas at $3.18. Minneapolis has the highest at $4.27.
In California, the lowest average price was $3.94 in Fresno. The highest was in San Francisco at $4.07. The average statewide for a gallon of regular was $4.03, up 18 cents.