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In reference to petroleum, bbl is an abbreviation for 1 barrel, equal to exactly 42 U.S. gallons, or to approximately 0.159 cubic meters.
Large petroleum production and consumption figures are usually expressed in 1 Mbbl, or 1 million barrels.
In the automotive word, the abbreviation also means "barrels", but in the sense of carburetor barrels.
See also: barrel (unit)
Petroleum