"RBOB," or reformulated gasoline blend stock for oxygen blending, is a newer blend of unleaded gas that is prepared for the addition of ten percent fuel ethanol, an alcohol based fuel produced by fermenting and distilling corn and other starch crops. Many gas stations now sell this mixture.
The biggest factor in the cost of gasoline is the price of the crude oil from which it is produced. In 2011, the retail price of gasoline was based on the cost of crude oil (68% of retail price); refining costs and profits (11%); federal and state taxes (11%); and distribution and marketing costs and profits (9%). A variety of factors influence the price of gas.
Economic and political areas of the Middle East and North Africa (MENA) region The area's valuable oil reserves, production, and refineries have caused many years of political unrest and fighting. Concern about near term and future oil supply can cause drastic movements in price.