Can Honda Civic Take E85 – Complete Guide

Adeel Amir

can honda civic take e85

Since E85 fuel is sometimes less expensive than ordinary fuel, it is frequently considered an option, especially with gas costs rising gradually and concerns about global warming growing. Regretfully, not every vehicle can operate on E85 as specified by the manufacturer.

So what effect does it have on E85-using Honda Civics? I searched the Honda website and social media for the solution since I wanted to know how to save money. This is what I found out.

Can Honda Civic Take E85? No, I do not advise you to drive your Honda Civic using E85. Honda officially said on their website that their engines are not certified to operate on E85 or any other alternative fuel at this time.

You run the risk of damaging your Honda Civic and voiding any warranty if you choose to install E85 in it. Here’s why, based on what I can determine…

Can Honda Civic Take E85 – Detailed Answer

The benefits of E85 flex fuel are appealing to different types of drivers. The notably reduced price per gallon will draw in the ordinary household. Due to E85’s lower carbon footprint, someone who cares about the environment will consider it.

Conversely, a person who is obsessed with horsepower and performance will stop at nothing to convert his vehicle to operate on E85 because of the significant boost in power that this fuel offers.

While most automakers began producing flex-fuel vehicles after 2008, Honda is an exception. To date, no Honda Civic is available to operate on E85 straight out of the factory. Using E85 in a Civic may lead to issues.

For instance, it may force the engine to operate on a lean mixture, which might result in severe engine damage. Gas tanks, faulty gasoline pumps, and broken fuel hoses are just a few of the other unavoidable problems.

Furthermore, using E85 in any vehicle without the manufacturer’s consent will invalidate the warranty.

Follow our guide How To Find Which Honda Civic Model You Have

Converted Honda Civic For E85

After everything is said and done, not all is lost. Depending on the model year, you can convert your Honda Civic to operate on E85. It is still feasible to modify earlier models, but it will be more difficult and only make sense if you are an enthusiast who wants to improve performance since the cost might end up being far greater than that of automobiles.

It would be beneficial to convert your Civic to operate on E85 given all the advantages and the comparatively modest conversion cost for newer models.

Thus, how can your Honda Civic be made to operate on E85, and is it worth the investment for your particular model?

Any recent Honda Civic (by recent I mean OBD2 vehicles made after 1996) that is to be converted to E85 will need a thorough remap of the ECU. Remaps may become expensive if you want to do them well, which, believe me, you will.

Another issue arises once you adjust your engine for E85. The proportions of ethanol to gasoline vary throughout E85 fuels. There may be differences in these ratios across petrol stations, states, or seasons. Installing an E85 kit that measures this ratio and transmits the data to the ECU to modify all the settings is necessary since the engine must always know the exact amount of ethanol in the gasoline to operate properly.

Nevertheless, this can shorten the lifespan of your gas tank, and if your gasoline lines and hoses aren’t flex-fuel rated, you’ll need to replace them. Just be sure to double-check this before doing so.

All of the above plus a lot more, such as larger fuel injectors and a larger fuel pump, are required for earlier Civics that are OBD1 or pre-1996. Because it’s a bench tune and the ECU has to be dismantled, the ECU tuning will also cost extra.

Therefore, this is the kind of Civic that will have an E85 conversion only for performance purposes since the financial savings will be greatly outweighed by the conversion’s cost.

Each E85 conversion is quite individual to the vehicle; this is just a basic rundown of what you will have to accomplish.

Conversion kit prices will vary, as will the price of ECU tuning and the potential need for a separate ECU, which will drive up the cost of the conversion to unimaginable levels.

Therefore, if you wish to convert to E85 to reduce your fuel costs or carbon impact, only think about doing so if your Civic is a more recent model. Also, be sure to thoroughly investigate all the necessary components and the associated costs.

Also, check out our separate post on How To Open Honda Civic Hood From Outside

The benefits and drawbacks of using Civic e85

Now that we know that no Honda Civic is equipped with E85 out of the factory and that there are sometimes complicated and expensive conversion options available, let’s review all the advantages and disadvantages of E85. Who knows, with all these advantages, it could be worth getting a new automobile.


  • It is less expensive than standard gasoline. Even though E85 uses more fuel than conventional gasoline, it will seldom be more than 20% more, meaning that it will always be less expensive to operate. On average, E85 will cost 32% less than gasoline. regardless of the vehicle.
  • E85 produces more energy. Increasing the power output of your engine was never an easy or inexpensive operation. However, E85 costs less than gasoline and offers an average 20% increase in horsepower and torque. For FFV, all that’s required is switching to a different gas station pump.
  • It facilitates a cooler engine run. While gasoline plays a vital role in cooling the engine’s internals, ethanol performs this function much more effectively. As a result, you will save even more money since your engine will last longer and create more power.
  • E85 significantly improves engine and component cleanliness. Once more, gasoline keeps carbon buildup within the engine clean, which is critical to maintaining the engine’s health and performance. Because it keeps the internals clean, ethanol performs this function much better than gasoline and will end up saving more money over time.
  • E85 combats global warming. In an extreme situation, E85 emits 50% less greenhouse gas than gasoline. Imagine, now, if every automobile switched to E85. It would be an understatement to suggest that it would have a major influence on global warming.


  • You should do some research on your location to see how few gas stations are.
  • Conversions are often costly.
  • Moisture absorption by ethanol causes subpar performance, although it may be reduced.


After doing all the research on the question of whether can honda civic take e85, I have come to the point that You can’t use the e85 in Honda Civic.


Is E85 good for the Honda Civic?

Can I run my Honda engine on E85? Honda engines cannot run on e85 since it contain 85% ethanol. Utilizing fuels containing more than 10% (E10) ethanol or methanol will result in issues with starting and/or performance.

Can you run E85 in a 2012 Honda Civic?

If you want additional power or torque, you may select to use ordinary gasoline and solely pump E85. This kit was created using very dependable parts and was extensively tested. The pre-assembled gasoline lines make it simple to install and connect the ethanol sensor.

Can a 2015 Honda Civic use E85?

Flex-fuel cars have become more and more popular in recent years due to their capacity to operate on a range of ethanol-based fuels, such as E85. You can convert your 2012–2015 Honda Civic Si (K24Z7) to E85, if you’re wondering whether it’s possible.

Is E85 safe for the engine?

E85 used to be able to eat away at various engine parts (before 1994). The majority of cars built in and after 1994 are resistant to ethanol. Federal legislation in the United States has mandated since 1994 that automobiles be ethanol-compatible. Therefore, engine damage from E85 hasn’t been a problem ever since.

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