Source: American Petroleum Institute (www.api.org). Figures are based on 1995 average yields for U.S. refineries. One barrel contains 42 gallons of crude oil. The total volume of products made is 44.2 GALLONS -- 2.2 gallons greater than the original 42 gallons of crude oil. This represents "processing gain," where other chemicals are added to the refining process to create the final products.
