RIVERSIDE, Calif. -

The average price of a gallon of self-serve regular  gasoline in the Inland Empire rose Tuesday for the 12th consecutive day, increasing 1.4 cents to $4.242, its highest amount since March 8, 2013. 

   The average price in Riverside and San Bernardino counties has rise 21.1 cents over the past 12 days, including 1.6 cents on Monday, according to figures from the AAA and Oil Price Information Service.

   The average price is 16.1 cents more than one week ago, 24.6 cents higher than one month ago and 25.1 cents above what it was one year ago.

   ``Gas prices are rising rapidly in response to a 30-cent, one-week increase in wholesale prices,'' Marie Montgomery of the Automobile Club of Southern California told City News Service.

   ``Those increases came on news of two local refineries being at least partly offline for longer than expected for maintenance and an increase in ethanol costs due to increased difficulty shipping it.''

   Another factor in the rising pump prices is a 35 percent increase in the percentage of exported gasoline between the last week in March and first week in April, reducing the supply, Montgomery said, citing figures from the California Energy Commission.