India is taking another step towards expanding the use of ethanol as an alternative to petrol, with new rules allowing vehicles designed to run on blends containing up to nearly pure ethanol.
On October 26, the Ministry of Road Transport and Highways (MoRTH) amended the Central Motor Vehicles Rules, 1989, to allow vehicles designed and certified to run on ethanol-petrol blends ranging up to E100.
The amendment creates a regulatory framework for flex-fuel vehicles (FFVs)* that can use high-ethanol fuels.
However, it does not mean that every petrol vehicle have to run on E100.
Fuels beyond E20 and up to E100 are intended only for vehicles specifically designed and certified to use them.
E100 refers to fuel containing nearly pure ethanol, although its exact composition can vary depending on the market and fuel specification. The fuel marketed as Ethanol 100 in India is not necessarily 100 per cent ethanol by volume.
Ethanol is an alcohol-based fuel commonly produced from crops such as sugarcane and maize. India’s push to expand its use is linked to efforts to reduce dependence on imported crude oil, create demand for agricultural produce and promote domestic biofuel production.
However, ethanol behaves differently from petrol. It can affect fuel-system materials, absorbs moisture and has different combustion properties. It requires vehicles specifically designed for high-ethanol fuel and a suitable distribution network.
India plans to introduce E100 through purpose-built, certified flex-fuel vehicles rather than convert the existing petrol-car fleet.
The rollout will depend on three key requirements:
E85 fuel has been introduced at selected Indian fuel stations, with plans reported for a wider network. E100 availability is also expected to begin at selected outlets before any broader expansion.
The pace of the rollout will depend on ethanol supplies, distribution infrastructure, fuel prices and the number of compatible vehicles on the road.
India’s Ethanol Blended Petrol (EBP) Programme aims to reduce reliance on conventional petrol by blending it with ethanol.
The country achieved its E20 target in 2025, five years ahead of the original 2030 deadline.
Since April 2026, petrol sold nationwide has been required to contain 20 per cent ethanol, while BS-VI vehicles must meet the applicable E20 emission standards.
Brazil is a leading example of large-scale high-ethanol fuel use. Its success stems from decades of government support, beginning with the Proálcool programme in 1975 to counter global oil shocks, and a well-established sugarcane ethanol industry.
Most new passenger vehicles sold in Brazil are flex-fuel vehicles (FFVs)*, which can run on petrol, hydrous ethanol or a combination of both. This allows drivers to choose their fuel based on prices at the pump.
The United States also has a substantial flex-fuel vehicle fleet, but its retail market focuses largely on E85, which can contain up to 85 per cent ethanol. Many European markets use lower blends, such as E5 and E10, while some offer higher blends for compatible vehicles.
Other countries have explored or introduced high-ethanol fuels, but the scale of use and availability vary considerably.
E100 could give India another option for reducing its reliance on imported crude oil. If produced domestically at scale, it could also create a larger market for agricultural feedstocks and support investment in biofuel production.
However, the benefits will depend on how the fuel is produced and distributed. Ethanol production requires feedstock, water, energy and transport. Its environmental impact also depends on factors such as farming practices, land and water use, and the energy
For most existing car owners, the answer is no. The government is not directing carmakers or owners to switch to E100 immediately or to switch their vehicles. The amendment creates a regulatory framework that allows automakers to manufacture and certify flex-fuel vehicles capable of running on E100.
Owners of regular petrol cars, including vehicles designed for E20, should continue using the fuel recommended by their vehicle manufacturer. They should not use E85 or E100 unless their vehicle is specifically approved for it.
Motorists should check the fuel compatibility sticker on their vehicle and follow the manufacturer's guidance in theowner's manual while opting for the fuel choice at the fuel station.
For anyone considering an E100-compatible vehicle in the future, the key questions will be its purchase price, real-world fuel economy, warranty terms and the availability of E100 nearby.
The rule change opens the door for high-ethanol vehicles in India. Whether they become a practical choice for drivers will depend on fuel availability, affordability and how quickly automakers introduce compatible models.
'Flex' is short for 'flexible'. Flex-fuel vehicles (FFVs) are equipped with specially designed fuel-system components and materials that allow them to run on different ethanol-petrol blends, depending on the vehicle’s specifications.
These vehicles have an internal combustion engine and can typically run on petrol, ethanol or a blend of the two stored in a single fuel tank. Vehicles designed and certified to run on high-ethanol blends, such as E85 or E100, are built to handle the fuel’s specific requirements and minimise material compatibility issues.