Typical Product Yield from Simple Distillation
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Source:  Energy Intelligence Group, Int'l Crude Oil Market Handbook

Average U.S. Refinery Yield
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Source:  Petroleum Supply Anuual, Table 19

*Note: Processing gain is the volume increase that results as denser molecules (e.g., residual fuel oil) are split into less dense ones (e.g. gasoline). The processing gain in U.S. refineries is equal to about 6%.