RIVERSIDE – The average price of a gallon of self-serve regular gasoline in Riverside County dropped today for the 14th time in the last 16 days, declining 1.3 cents to $4.072, one day after falling 1.5 cents.The recent trend comes after a run of 20 increases in 22 days totaling 59.8 cents pushed the average to its highest amount since July 21, 2015, according to figures from the AAA and Oil Price Information Service.The average price is 7.8 cents less than one week ago, but 37 cents more than one month ago and 27.2 cents higher than one year ago.