Why is gasoline price in california and Washington state so much higher than national average?

Unbelievable! national average is today (4/12) $4.13 (just 11 cents more than end of march 2 weeks ago) but california $6?

Why is gasoline price in california and Washington state so much higher than national average?

In picture why?

Why is gasoline price in california and Washington state so much higher than national average?
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