Maruti unveils India’s first flex-fuel car: What is a flex fuel vehicle? How does it work? Will it cut your fuel bill? Here’s all

on Thursday launched India’s first flex-fuel passenger car, betting on ethanol-based mobility as a key strategy to reduce fuel imports, curb carbon emissions and strengthen energy independence.

While EVs, hybrids and CNG vehicles remain central to India’s clean mobility transition, flex-fuel technology is emerging as another promising pathway to reduce emissions and curb dependence on imported crude oil.

What are flex-fuel cars?

Flexible Fuel Vehicles (FFVs) are equipped with internal combustion engines that can run on petrol as well as petrol-ethanol blends containing up to 83% ethanol. While they use a single fuel system similar to that of conventional petrol vehicles, certain components are specially designed to handle ethanol’s distinct chemical properties and lower energy content. These modifications include ethanol-compatible fuel pumps, fuel injectors and other fuel system parts. Additionally, the engine control module (ECM) is calibrated to adjust for ethanol’s higher oxygen content, enabling the vehicle to operate efficiently on varying fuel blends.

Flex-fuel vehicles (FFVs) are specially designed automobiles that can run on petrol as well as ethanol-blended fuels. Unlike conventional petrol vehicles, which can handle only limited ethanol blends, FFVs are capable of operating on fuels ranging from E20 to E85 and, in some cases, even E100. Their engine management systems automatically detect the ethanol concentration in the fuel and adjust engine settings to ensure optimal performance.

Ethanol is a renewable, plant-based fuel produced from agricultural feedstocks such as sugarcane, corn and biomass. In India, sugarcane remains the primary source of ethanol production. The government’s push towards ethanol blending is aimed at reducing dependence on imported crude oil while creating additional opportunities for the domestic agriculture sector.

While flex-fuel vehicles look similar to conventional petrol cars, they are equipped with specialised components that can withstand higher ethanol concentrations. These include corrosion-resistant engine parts, ethanol-compatible fuel systems, fuel composition sensors and advanced software capable of managing different fuel blends. As a result, FFVs can seamlessly switch between varying ethanol-petrol mixtures without any input from the driver.

The ethanol content in fuel is denoted by the letter “E”. For instance, E20 contains 20% ethanol and 80% petrol, E85 contains 85% ethanol and 15% petrol, while E100 refers to pure ethanol. India has already rolled out E20 fuel across several regions and is gradually expanding infrastructure for higher ethanol blends.

A major advantage of flex-fuel vehicles is their potential to lower India’s oil import bill by increasing the use of domestically produced fuel. Ethanol also burns cleaner than conventional petrol, helping reduce certain tailpipe emissions. Additionally, greater ethanol production can boost demand for agricultural feedstocks, supporting farmers and strengthening the rural economy. FFVs also offer consumers greater flexibility by allowing them to use different fuel blends based on availability and pricing.

What are the disadvantages?

Despite their potential benefits, flex-fuel vehicles face several challenges. One of the biggest is that ethanol contains less energy than petrol, which means vehicles running on higher ethanol blends may deliver lower fuel efficiency. Fuel infrastructure is another constraint. Although the government plans to set up 5,000 E100 fuel stations across the country over the next two years, the distribution network for higher ethanol blends is still in its infancy. In addition, consumer choices remain limited, with only a handful of flex-fuel models currently available in the market.

The government sees flex-fuel technology as part of a broader clean mobility strategy alongside electric vehicles, hybrids and CNG-powered vehicles. By increasing the use of domestically produced ethanol, flex-fuel vehicles can help reduce crude oil imports, support energy security and lower emissions without requiring significant changes in consumer driving habits. Automakers such as Maruti Suzuki, Toyota and Honda have already showcased flex-fuel vehicles and prototypes tailored for the Indian market.

For consumers, FFVs could emerge as another viable alternative in the evolving mobility landscape. Their ability to run on multiple fuel blends offers greater flexibility and could potentially reduce running costs if ethanol remains competitively priced. However, large-scale adoption will ultimately depend on the availability of ethanol-based fuels, the pace of infrastructure development and the overall economics of ownership.

Will it save money?

Oil Minister Hardeep Puri has revealed if just 50% of new two- and four-wheeler sales transition to flex-fuel vehicles, it could generate an additional demand of 311.8 crore litres of ethanol, boost farmers’ income by ₹12,403 crore, and reduce carbon dioxide emissions by 66.4 lakh metric tonnes, highlighting the technology’s potential economic and environmental impact.

Ethanol is generally cheaper than petrol because it is produced domestically from crops such as sugarcane and maize. If a high-ethanol blend such as E85 (85% ethanol) is priced significantly lower than petrol, FFV owners can benefit from lower fuel costs.

However, there is a trade-off. Ethanol contains less energy than petrol, meaning vehicles running on higher ethanol blends typically deliver lower mileage. An FFV may need more fuel to travel the same distance compared to running on pure petrol. As a result, the actual savings depend on whether the lower price of ethanol outweighs the drop in fuel efficiency.