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How Gas Prices Work
Information about how gas prices are determined, including U.S. gasoline usage and consumption, regional price differences, a percentage breakdown of components that determine gas prices, control and impact of the oil market by the Organization of the Petroleum Exporting Countries (OPEC), U.S. domestic production and supplies, and related resources.
http://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/gas-price.htm

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