Costco members fill up with discounted gasoline at a Costco gas station in Van Nuys, Calif., Friday, Oct. 5, 2012. Californians woke up to a shock Friday as overnight gasoline prices jumped by as much as 20 cents a gallon in some areas, ending a week of soaring costs that saw some stations close and others charge record prices. (AP Photo/Damian Dovarganes)

Associated Press
Costco members fill up with discounted gasoline at a Costco gas station in Van Nuys, Calif., Friday, Oct. 5, 2012.  Californians woke up to a shock Friday as overnight gasoline prices jumped by as much as 20 cents a gallon in some areas, ending a week of soaring costs that saw some stations close and others charge record prices. (AP Photo/Damian Dovarganes)
Costco members fill up with discounted gasoline at a Costco gas station in Van Nuys, Calif., Friday, Oct. 5, 2012. Californians woke up to a shock Friday as overnight gasoline prices jumped by as much as 20 cents a gallon in some areas, ending a week of soaring costs that saw some stations close and others charge record prices. (AP Photo/Damian Dovarganes)
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