How many gallons of gasoline does a barrel of oil make?

One barrel (42 gallons) of crude oil , when refined, produces approximately 19.6 gallons of finished motor gasoline, as well as other petroleum products. More.

U.S. refineries produce between 19 and 20 gallons of motor gasoline from one barrel (42 gallons) of crude oil. The remainder of the barrel yields distillate and residual fuel oils, jet fuel, and many other products. Refinery yields of individual products vary from month to month as refiners focus operations to meet demand for different products and maximize profits.

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