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In page Filling station:

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Individual filling stations in the United States have little if any control over gasoline prices.[citation needed] The wholesale price of gasoline is determined according to area by oil companies which supply the gasoline, and their prices are largely determined by the world markets for oil. Individual stations are unlikely to sell gasoline at a loss, and the profit margin—typically between 7 and 11 cents a US gallon (2–3 cents per liter)—that they make from gasoline sales is limited by competitive pressures: a gas station which charges more than others will lose customers to them. Most stations try to compensate by selling higher-margin food products in their convenience stores.