Frequently asked questions

Your vehicle can only use E85 if it is configured to do so. By installing one of our kits, your vehicle will become compatible with E85.

However, we do not offer our kits for all vehicles. To see if we have a kit for your vehicle, please use the year/make/model lookup tool on the home page.

NOTE: If we don’t have a kit for your vehicle, don’t give up! Let us know your vehice make/model/year and VIN and we will research it for you - go to Inquiry page and send us message.

Our kits can not be added to any diesel engine, any engine with a carburetor (most vehicles built before 1986 are carbureted), or engines that have a mechanical fuel injection system instead of an electronic fuel injection system (not common).

Assuming you want more performance - and assuming the engine is modern enough to have electronic fuel injection - than the answer is yes. E85 is a mix of ethanol and gasoline. Because E85 contains a large proportion of alcohol, it is higher octane than gasoline.

Higher octane fuels will make more horsepower with proper tuning.

Read more about the performance aspects of eFlexFuel.

The answer is almost always yes. eFlexFuel and E85 usually generate even more power when used on a modified engine.

However, if you have a modified engine, please contact us and describe your modifications so we can confirm compatibility.

All eFlexFuel kits make your vehicle E85 flex fuel capable, meaning your vehicle can run on gasoline, E85, or any mixture of the two.

Our kits are bolt-on, warrantied for 5 years, and easily removed.

eFlexPlus allows fuel savings and performance tuning, while eFlexPro delivers full tuning control with advanced software.

Installing a kit helps reduce your carbon footprint using renewable ethanol fuel.

You can view the latest pricing on our product page.

United States

The only taxes you pay are the applicable sales taxes calculated and collected during checkout on our website. No additional taxes or duties are charged upon delivery.

Rest of the World

For orders shipped outside the United States, local customs duties, import taxes, VAT, and other government fees may apply. These charges are not included in the product price or shipping cost shown on our website and are the responsibility of the customer.

Customs regulations and fees vary by country, so we recommend checking with your local customs office for more information.

We have a separate website for customers outside the United States: eflexfuel.com/en

We’ll send you the right one ASAP. Contact us at support.eflexfuel.com.

Please contact us to obtain a return authorisation number and shipping instructions.

Returned items must be unused and in original condition.

Typically around 3 working days within the United States.

We provide installation guides and videos. Please checkout our support site.

Professional installation typically takes 2–3 hours. Our installation shops can be viewed here.

Notify us within 30 days. Return authorisation is required.

Contact us immediately and keep the packaging for carrier claims.

Yes — use regional sites:

• International: eflexfuel.com/en
• France eflexfuel.com/en
• Finland eflexfuel.com/en

Orders are processed normally within 24h workdays and delivery takes usually in 2-4 days via DHL.

Yes, tracking is emailed after dispatch.

Available payment methods can be viewed here.

Contact us immediately. Once shipped, returns apply.

2-year warranty, extendable to 5 years after registration.

Use our vehicle lookup tool or contact support.

Yes. Typically takes 2–3 hours using basic tools.

Please checkout our support site.

Included with shipment and available online.

Please checkout our support site.

In 99% of cases, no upgrades are needed.

Yes, removal is simple and non-permanent.

Improves performance, throttle response, and cooling.

Not with a proper kit installed.

Follow manufacturer guidelines; kit itself requires no maintenance.

Yes — the system automatically adjusts for any mix.

Fuel economy may drop but costs are often lower.

Typically 20–40% cheaper than gasoline.