In this Thursday, Apr. 25, 2013, photo, the logo of Chevron is 

In this Thursday, Apr. 25, 2013, photo, the logo of Chevron is seen at a gas station downtown Los Angeles. Chevron Corp. reports quarterly financial results before the market opens on Friday, April 26, 2013. (AP Photo/Damian Dovarganes)
Associated Press
In this Thursday, Apr. 25, 2013, photo, the logo of Chevron is seen at a gas station downtown Los Angeles. Chevron Corp. reports quarterly financial results before the market opens on Friday, April 26, 2013. (AP Photo/Damian Dovarganes)
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