The average price of a gallon of self-serve regular gasoline in Riverside County dropped nine-tenths of a cent Thursday to $4.443. The average price is 3.1 cents less than one week ago, 15.3 cents less than one month ago and 80.1 cents less than one year ago, according to figures from the AAA and Oil Price Information Service. It has dropped $1.93 since rising to a record $6.373 on Oct. 5, 2022.