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Can you run E85 Flex Fuel in your 2012-2015 Honda Civic Si? With an eFlexFuel kit installed, you can, and here's why it's a good idea.

In recent years, flex fuel vehicles have gained popularity for their ability to run on a variety of ethanol-based fuels, including E85. If you own a 2012-2015 Honda Civic Si (K24Z7) and are wondering whether you can make the switch to E85, the answer is yes! By installing an eFlexFuel E85 conversion kit, you can take advantage of the benefits of flex fuel and enjoy significant savings while improving your vehicle's performance. 

Understanding Flex Fuel Vehicles 

Before we dive into the advantages of E85 and eFlexFuel kits, let's briefly explore what flex fuel vehicles are. Flex fuel vehicles, often referred to as "flex fuel cars," are designed to run on a mixture of gasoline and ethanol, typically containing up to 85% ethanol (E85). These vehicles are equipped with special components that allow them to adjust to varying ethanol levels, making them more versatile at the pump. 

The Benefits of Running E85 in Your Honda Civic Si 

  1. Cost Savings
  • One of the primary reasons to consider using E85 in your 2012-2015 Honda Civic Si is the potential for cost savings. E85 is often cheaper than regular gasoline, making it an attractive option for budget-conscious drivers. Plus, the eFlexFuel kit ensures that your vehicle runs efficiently on E85, maximizing your savings. 
  1. Increased Horsepower
  • E85 is known for its higher-octane rating compared to regular gasoline. This means that when you switch to E85, your engine can produce more power, leading to increased horsepower. If you're looking to boost your Civic Si's performance, running E85 with an eFlexFuel kit is a great way to achieve that. 
  1. Environmental Benefits
  • E85 is a cleaner-burning fuel, as it contains a higher percentage of ethanol derived from renewable sources like corn. By using E85 in your Honda Civic Si, you can reduce your carbon footprint and contribute to a greener environment. 

How the eFlexFuel Kit Works 

The eFlexFuel kit is a crucial component that enables your Honda Civic Si to run on E85 with ease. It includes essential elements such as an ethanol sensor, control unit, vehicle-specific wiring harness and fuel line and fuel accessories, ensuring your vehicle's engine operates optimally. With the eFlexFuel kit installed, you don't need to worry about switching between tunes at the pump. You’ll be able to safely run E85, gas, or any blend! 

Pros and Cons of Flex Fuel 

While there are several benefits to running E85 in your Honda Civic Si, it's essential to consider the pros and cons of flex fuel vehicles: 


  • Cost savings with cheaper E85 fuel
  • Increased horsepower and performance
  • Environmental benefits with cleaner-burning ethanol 


  • Slightly lower fuel efficiency with E85
  • Availability of E85 fuel may vary by location 


In summary, if you're a proud owner of a 2012-2015 Honda Civic Si and want to explore the advantages of running E85, installing an eFlexFuel kit is a wise choice. Not only will you save money at the pump, but you'll also experience improved performance and contribute to a more sustainable future. With eFlexFuel's ethanol conversion kits, you can unleash the full potential of your flex fuel vehicle and enjoy the benefits of E85. 

Ready to make the switch? Visit eFlexFuel.com today and discover the world of E85 conversion kits for your Honda Civic Si and other flex fuel vehicles. Make the smart choice for your wallet, your car, and the environment with eFlexFuel. 

September 9, 2022

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