The average price of a gallon of self-serve regular  gasoline in the Inland Empire rose today for the eighth time in 10 days,  increasing four-tenths of a cent to $3.592.
      The average price in Riverside and San Bernardino counties is 4.8 cents  more than one week ago but 13.1 cents less than one month ago and 5 cents lower  than one year ago, according to figures from the AAA and Oil Price Information  Service.
      The average price has risen 4.7 cents over the past 10 days. It was  unchanged on Wednesday.