What is Flex Fuel: Pros, Cons and Types

Table of Content

• About Flex Fuel
• What is a Flex Fuel Vehicle?
• Types of Flex Fuel
• Pros of Flex Fuel
• Cons of Flex Fuel
• Conclusion

About Flex Fuel

Flex fuel or flexible fuel is a combination of unblended petrol with different ratios of plant-derived ethanol (majorly sugarcane). This fuel can be a mix of 85% ethanol and 15% gasoline (E85), E20, or any combination of these two fuels. The ‘E’ represents the percentage of ethanol by volume.

The growth in flex fuel usage is mainly driven by government initiatives that promote green transportation and environment sustainability. Ethanol blending in petrol has grown from 1.5% in 2014 to 20% in 2026. The increasing use of flex fuel will help India reduce oil imports and help its sugarcane farmers.

What is a Flex Fuel Vehicle?

A Flex-Fuel Vehicle (FFV) comes with a factory-fitted internal combustion engine that easily runs on any proportion of these petrol and ethanol mixtures. This is an alternative fuel vehicle that is different from regular cars, and FFVs can easily handle the high ethanol content in the fuel. An FFV easily adjusts to different combinations of flex fuel ranging from E20 to E100.

Standard petrol vehicles can’t run smoothly on ethanol-blended fuel. FFVs can support higher ethanol range due to special features like:

• Corrosion resistant parts that easily withstand ethanol.
• Heavy-duty fuel injection hardware offers more fuel per cycle.
• Smart ECU (Electronic Control Unit) helps adjust engine settings as per the fuel blend.

Types of Flex Fuel

Flex fuel can be classified into three main categories:

Pros of Flex Fuel

Currently India has mostly cars and bikes with flex fuel options, and in commercial vehicle there is Tata Ace Flex mini truck. Below is a list of benefits of flex fuel:

Low Greenhouse Gas Emission

E85 vehicles can help reduce 61% of greenhouse gas emissions compared to petrol vehicles.

Flex Fuel Costs Less

E85 is comparatively ₹ 20 cheaper than regular petrol, but there are other things like mileage to be considered.

Fuel Flexibility

FFVs can run on ethanol-blended petrol like E20, E85, or a mix. Also, if blended fuel is not available then you can choose regular petrol.

Farmer Support

The use of domestic crops like sugarcane and maize for ethanol production is actually helping boost agriculture and farmer's income.

Reduced Dependency on Oil Imports

India is world's third-largest crude oil importer and consumer, but the ethanol blending is aimed at becoming self-sustainable and reduce oil imports.

Cons of Flex Fuel

These blended fuels also have some shortcomings that we have listed below:

Mileage is Lower

Ethanol has lower energy density than petrol, and this can result in lower mileage.  

Flex Fuel Vehicles Are Costly

The price of FFVs is generally a little higher than regular fuel vehicles.

Limited Fuel Availability

The lack of E85 or E100 fuel dispensing pumps can make driving on long routes difficult.

Conclusion

Flex fuel is a way for a more sustainable future with less pollution. The increasing availability of E20 and rolling out of E85 flex fuel will help cut emissions, reduce oil imports, and provide flexibility to consumers. Flex fuel can cost more upfront and still has limited fuel availability, but for most bike or car buyers today, flex fuel can be a promising option. In commercial vehicle, flex fuel option is currently available only in Tata Ace Flex Fuel mini truck. If you do consider getting a flex fuel vehicle, then check out the blend compatibility and pump availability first.