About ethanol content in gasoline

Ethanol  

Oxygenated fuel for gasoline vehicles.
Ethanol is a non-fossil fuel that is produced from a variety of agricultural crops such as sugarcane and grains. Ethanol is used in California Cleaner Burning Gasoline and the reformulated gasoline required in many of the major metropolitan areas of the country. In addition, to meet the Renewable Fuels Standard included as part of the Energy Independence and Security Act of 2007, gasoline ethanol blends have been introduced to the rest of the country.

How much ethanol is in regular gasoline?

Almost all gasoline now has some ethanol in it. Our Exxon and Mobil branded gasoline currently contains up to 10%. Gasoline with 10% ethanol content is known as E10, and with 15% ethanol it’s known as E15. Ethanol flex fuel (formerly known as E85) has between 51 and 83% ethanol with the remainder being gasoline. E15 is only appropriate for use in Flex Fuel vehicles or a very small percentage of the newest vehicles. Anything higher than E15 ethanol content is only appropriate in Flex Fuel vehicles. Refer to your owner’s manual to confirm your vehicle’s requirements.

FAQs about ethanol

Ethanol contains less energy than gasoline per gallon of fuel, but any changes in the fuel economy performance of your vehicle are expected to be minimal.
Water in your vehicle’s fuel system may cause problems regardless of whether ethanol is present or not. A number of products are available to remove water from your fuel system. You should consult your mechanic for a recommendation.
Regular vehicle maintenance is always recommended, regardless of fuel type. Gasoline containing up to 10% ethanol is suitable for use in most vehicles and will not require additional maintenance.
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Sources:
"Gasoline." EPA. Environmental Protection Agency, n.d. Web. 06 Apr. 2014. FAQs U.S Energy Information Administration 01 Dec 2015

**Fuel economy improvement is based on Synergy-branded gasoline compared to gasoline meeting minimum U.S. government standards. Actual benefits will vary based on factors such as vehicle type, driving style and gasoline previously used. Exxon, Mobil and Synergy are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries.

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