Cal. Rev. & Tax. Code § 46021

“Petroleum products” means any liquid hydrocarbon at atmospheric temperature and pressure that is the product of the fractionation, distillation, or other refining or processing of crude oil and that is used as, useable as, or may be refined as, a fuel or fuel blendstock, including, but not limited to, gasoline, diesel fuel, aviation fuel, bunker fuel, and renewable fuels containing more than 5 percent of petroleum products.