[michigander]

From: USGS
6. Each barrel of oil has 42 gallons.

From: chevroncars.com
An Average Barrel

(42 U.S. gallons) is refined into:

• Gasoline (18 Gallon)
• Kerosene, Light Fuel Oil (10 Gallons)
• Residual Fuel Oil (5 Gallons)
• Jet Fuel (3 Gallons)
• Lubricating Oil, Asphalt, Wax (2 Gallons)
• Chemicals For Use In Manufacturing (Petrochemicals) (2 Gallons)
• Other (2 gallons)

The type of crude oil being processed determines the amount of each product obtained from each barrel.

[Aurelius]

O.k., I stand corrected, I assumed "barrel" meant standard U.S. liquid barrel (as defined in 1953). I guess that isn't the case for an oil barrel.