SACRAMENTO, Calif. (MCT) — With gas prices hovering near $5 a gallon in California, the state’s politicians are simultaneously pressing for relief and questioning whether the oil industry is manipulating the market.

The California Air Resources Board said Monday that it had granted Gov. Jerry Brown’s request over the weekend to allow refineries to switch early to making cheaper winter-grade fuel. The idea is to boost the supply of gasoline, but analysts said it’s unclear how quickly the change will bring prices down, or by how much.