Paywalled, but from another piece, “ high California gas prices should encourage supply to be shipped to California from other states. But this doesn’t happen, because no other state formulates California’s unique gasoline blend. If gasoline is imported into California, which does occur when a California refinery goes offline for repair or maintenance, it comes from either South Korea or New Brunswick, Canada, by ship. This process is expensive, and it can take weeks”
https://www.hoover.org/research/why-are-gas-prices-so-high-c...