A US capacity measure (for liquid) equal to 4 quarts or 3.785 liters. Note also there are different measures of US dry gallons and UK gallons.
US bbl oil =
US gal lqd * 0.023810
US measurement of volume for petroleum. See also US liquid barrels, US federal barrels, US dry barrels and UK barrels.
US Gallons (Liquid) to US Barrels (Oil)
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