Road Transport Ministry amends rules to promote E85 and E100 flex-fuel vehicles

What has happened

The Ministry of Road Transport and Highways has issued a notification amending the Central Motor Vehicles Rules, 1989. The aim is to promote flex-fuel vehicles that can run on E85 and other fuels with higher ethanol content. The notification is dated 26 October 2026.

What has changed

Under the amendments, the rules for emission certification have been updated and now explicitly include E85 as well as E100. Vehicles certified for these fuels must meet the emission and safety standards applicable to their category. The notification also updates provisions related to biodiesel and makes technical improvements. The new rules take effect from the date of publication in the official Gazette.

What is E85

E85 is a blend of petrol and ethanol containing up to 85 percent ethanol by volume. The letter ‘E’ stands for ethanol and the number shows how much of it is in the fuel.

How flex-fuel vehicles work

Countries such as Brazil and the United States already use flex-fuel technology. These vehicles are designed to run on different blends of ethanol and petrol using the same fuel tank. Depending on the vehicle’s design and certification, the blend can go up to E85 or E100, which is mainly ethanol. Fuel system parts and materials are chosen according to the approved blends, and the engine control system adjusts itself to the fuel composition. This lets users choose their fuel within the range certified and declared by the manufacturer.

Who benefits

According to the ministry, greater use of ethanol produced in the country can reduce dependence on imported crude oil. Using it in vehicles specially designed for ethanol can cut some harmful emissions. Depending on the raw material and production process, greenhouse gas emissions during ethanol production and use may also come down.

What it means for existing vehicle owners

E85/E100 can be used only in vehicles specially designed and certified for it. It is not suitable for vehicles generally available in the market or those already in use. A vehicle being compatible with E10 or E20 does not make it suitable for E85. The notification says owners of existing vehicles are not required to start using E85 now or later, or to make any changes to their vehicles.

What you should do

Vehicle owners should check the fuel compatibility sticker on their vehicle. When choosing fuel at a station, follow the manufacturer’s instructions given in the owner’s manual.