The average price of a gallon of self-serve regular gasoline in Riverside County dropped today for the 27th time in 28 days, decreasing a half-cent to $4.285. The average price has dropped 41.4 cents over the past 28 days, including 2.3 cents Sunday, according to figures from the AAA and Oil Price Information Service. It dropped 20 consecutive days, rose one-tenth of a cent last Monday and resumed dropping Tuesday. The run began one day after a six-day streak of decreases totaling 7.1 cents ended. The average price is 13.9 cents less than one week ago and 41.4 cents lower than one month ago, but 2.4 cents more than one year ago. It has dropped $2.088 since rising to a record $6.373 on Oct. 5, 2022. The national average price dropped for the 11th time in 12 days, decreasing four-tenths of a cent to $2.906. It has dropped 9.3 cents over the past 12 days, including seven-tenths of a cent Sunday. The…..