What is E15 fuel?
Ethanol blends in the U.S. fuel market
Most of our Exxon™ and Mobil™ branded gasoline is E10 fuel, or fuel that contains up to 10% ethanol — commonly referred to as Unleaded 87 (UNL 87) or standard regular.
The presence of E15 fuels has grown with the Energy Independence and Security Act of 2007 (part of the Renewable Fuel Standard), which requires increasing amounts of renewable fuels (such as ethanol and biomass-based diesels) to be blended into gasoline and diesel sold in the U.S.
Additionally, the Environmental Protection Agency (EPA) has approved gasoline blends containing up to 15% ethanol (E15 fuels) for use in flex-fuel vehicles and most cars, trucks and SUVs manufactured from 2001 onward. As a result, E15 has become more common across the marketplace. E15 fuel dispensers have EPA-required labels stating necessary disclaimers.
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”Frequently Asked Questions.” U.S. Energy Information Administration (EIA). Web. 28 May 2025.