Average LA, Orange County Gas Prices Rise To Highest Amounts Since 2023 By STEVEN HERBERT, City News Service The average price of a gallon of self-serve regular gasoline in Los Angeles County rose Tuesday to its highest amount since Oct. 6, 2023, increasing 1.8 cents to $6.059. The average price has risen six consecutive days, increasing 13.9 cents, including six-tenths of a cent Monday, according to figures from the AAA and Oil Price Information Service.