RIVERSIDE, Calif. -

The average price of a gallon of self-serve regular  gasoline in the Inland Empire fell Tuesday for the 19th consecutive day, dropping a half-cent to $4.144

      The average price in Riverside and San Bernardino counties is 6.5 cents  less than one week ago, 10.9 cents lower than one month ago and 22.5 cents  below what it was one year ago, according to figures from the AAA and Oil Price  Information Service.

      The average price has dropped 14.7 cents during the 19-day streak of  declines, including seven-tenths of a cent on Monday.

      The average price rose 30 times in the 31 days preceding the streak of  declines, increasing 57.5 cents over that span.

      The average price has been dropping because most California refineries  have concluded scheduled maintenance without experiencing any major incidents  before the switch to summer-blend production, leaving adequate gasoline  supplies, said Jeffrey Spring of the Automobile Club of Southern California.