U.S. Department of Energy | Office of Energy Efficiency and Renewable Energy U.S. Department of Energy Office of Energy Efficiency and Renewable Energy

Fuel Blends

Blending amounts of alternative fuel with conventional fuel is one way to displace petroleum. Examples of low-level fuel blends include E10 (10% ethanol/90% gasoline), E15 (10.5% to 15% ethanol blended with gasoline), B5 (5% biodiesel/95% diesel), and B2 (2% biodiesel/98% diesel). Blends can also consist of two types of alternative fuels, such as hydrogen and compressed natural gas (HCNG), which can be a combination of 20% hydrogen/80% CNG. B20 (20% biodiesel/80% diesel) and E85 (51% to 83% ethanol blended with gasoline depending on geography and season) are not considered low level blends.

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