Unleaded15TM provides an octane rating of 88. It contains approximately 15% ethanol and is approved by the EPA for use in model year 2001 or newer cars, light-duty trucks, SUVs and Flex Fuel Vehicles. Consult your vehicle’s manufacturer for compatibility and warranty details. Unleaded15 is the most tested fuel in the marketplace to date, typically costs less than Unleaded, and is widely believed to deliver better performance and fewer harmful emissions.

Unleaded15 is not an approved fuel for vehicles model year 2000 and older, motorcycles, off-road vehicles (like snowmobiles and boats), vehicles with heavy-duty engines (such as buses and delivery trucks), or engines in off-road equipment (like lawnmowers and chainsaws).


Q: Why is Thorntons offering Unleaded15?
A: In addition to promoting cleaner air through reduced carbon emissions and helping reduce our dependence on foreign oil, we also want to offer our guests the widest possible selection of fuels to meet their vehicle’s needs.

Q: What is ethanol?
A: Unlike petroleum, which is a limited resource, ethanol is an alcohol fuel derived from plant materials like corn or sugar cane, making it renewable. A majority of the ethanol that is blended into gasoline today is produced domestically, helping to support our agricultural economy.

Q: Will Unleaded15 hurt my engine?
A: Unleaded15 is EPA approved for use in 2001 and newer cars, trucks, and SUVs, representing more than 80% of the vehicles on the road today. We recommend consulting your vehicle’s manufacturer for compatibility and warranty details.

Q: What are the benefits of using Unleaded15?
A: Unleaded15 is a great choice for many reasons.

Cost – Unleaded15 typically costs less than Unleaded, which saves our guests money at the pump.

Performance – The increased ethanol content in Unleaded15 provides an octane rating of 88, which falls between Unleaded (87) and Unleaded Plus (89). Fuels with higher octane ratings have the potential to offer improved engine performance and efficiency, depending on several variables (including vehicle type and driving style).

Reduced Harmful Emissions – Ethanol burns cleaner in engines, with data from the Argonne National Laboratory showing that on average corn ethanol reduces greenhouse gas emissions by 34% or more compared to gasoline.

Which locations offer Unleaded15?

Thorntons has partnered with federal and state energy and agricultural offices as well as clean air groups, clean cities coalitions, and corn growers associations across the Midwest to provide Unleaded15 and E85 to our guests. Check our location finder to see which of our many Thorntons locations offer E85.

Location Finder

Unleaded15 and the Unleaded15 logo are trademarks of Thorntons Inc. Thorntons is a registered trademark of Thorntons Inc. © 2016 Thorntons Inc. All rights reserved.

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