First off, geography is a big factor.
“The West Coast is kind of a ‘Petro Island,'” explained Patrick De Haan, head of petroleum analysis at GasBuddy. The Rocky Mountains cut off the West from the rest of the country, making it a tight and more secluded market.
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The first paragraph says it just not taxes, and down near the bottom it says Pennsylvania's gas taxes are higher.
Big deal - California has the second highest gas tax in the US, but they're trying to play it like it's not a major factor.
Then they forgot to mention California's regularly scheduled refinery fires. That seems to happen at least once a year.