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Gas is never cheap in California.

But if you’ve filled up your tank in recent days, you may have found yourself wincing more than usual.

That’s because, for the first time since July 2015, the average price for a gallon of gas in the Golden State pushed past $4, Dan McTeague, a senior petroleum analyst with the site GasBuddy, told me on Monday afternoon.

“That’s a psychological benchmark for a lot of people,” he said. “It’s been a long time coming.”

So what’s causing the price spike?