https://www.mercurynews.com/2019/10/03/editorial-california-ag-should-investigate-unexplained-gas-surcharge/

With California gas prices rising, it’s time for state officials to solve the mystery of an unexplained gas surcharge motorists have been paying for at least four years.

Industry experts are blaming the recent price hike on refinery production challenges in the state and the Sept. 14 attack on a major Saudi oil facility. But that’s on top of an estimated 20-30 cents a gallon price bump Californians have been paying since 2015 that cannot be explained by the state’s taxes and special fuel blends to fight pollution and climate change.