I'm a bit perplexed on this one-- Yes, we refine our own blend of gasoline, but it's based on market oil -- nothing about the war we started with Iran impacts our domestic refining capability.
Also, oil takes longer to get from Iran to the west coast than to the east coast. Shouldn't the east coast be the first to notice decreased shipments, because the west coast essentially has a stock still in transit for longer?
EDIT: Nevermind, now I see that 25% of CA gas is refined overseas.