E100 Ethanol Fuel in India: What the New Rules Allow, Which Cars Can Use It and Why Yours Cannot

What the Government Actually Changed

On 23 October 2026, the Ministry of Road Transport and Highways notified amendments to the Central Motor Vehicles Rules, 1989, under G.S.R. 911(E). The notification was published in the Gazette on 26 October. In plain terms, it rewrote every reference to "E85" in the emission and testing tables of Rule 115 and Rule 115E to read "E85 or E100", formally bringing a fuel that is almost entirely ethanol inside the regulatory framework.

The amendment also raised the weight threshold for the light petrol and diesel vehicles covered by these provisions from 3,000 kg to 3,500 kg, standardised E10 and E20 as the reference petrol blends, and made technical corrections to biodiesel provisions. None of that is glamorous. The part that matters to a buyer is a single explanatory note: E85 and E100 may be used only in vehicles that original equipment manufacturers have designed and certified as flex-fuel vehicles.

The Four Fuel Grades, and Who Can Use Them

India's fuel market now has four defined petrol grades, and the compatibility rules are stricter than most people assume. A car approved for E20 is not approved for E85. The mi ::KEY_NUMBERS:: Ethanol in E100 | typically 93-95% E20 mandate in force since | 1 April 2026 Flex-fuel cars on sale in India | one, the Maruti WagonR Flex Fuel Weight threshold raised from | 3,000 kg to 3,500 kg ::TLDR:: The Motor Vehicles Rules now recognise E85 or E100 in emission testing, but only for vehicles certified as flex-fuel Your E20-compliant petrol car cannot run on E85 or E100, and the government says nothing is changing for existing owners India has one flex-fuel car and two flex-fuel two-wheelers on sale, with more announced but not launched Ethanol carries less energy per litre than petrol, so an E100 car will use more fuel to cover the same distance ::CHART:: type: bar title: Ethanol content by fuel grade (% by volume) labels: E10,E20,E85,E100 values: 10,20,85,100 source: AUTOINDIA from the MoRTH notification and PIB briefing ::TIMELINE:: 2023 | Indian automakers begin making E20-material-compliant vehicles 2025 | India reaches its 20% ethanol blending target, five years ahead of the 2030 goal 1 April 2026 | E20 becomes the mandatory standard petrol nationwide June 2026 | Maruti Suzuki launches the WagonR Flex Fuel; Hero launches flex-fuel Splendor+ and HF Deluxe Mid-2026 | E85 begins selling at select Indian Oil outlets 23 October 2026 | MoRTH notifies G.S.R. 911(E) 26 October 2026 | notification published in the Gazette ::GLOSSARY:: E20 | petrol blended with 20% ethanol by volume Flex-fuel vehicle | a car or bike designed to run on any blend from petrol to E85 or E100 using one tank Blending | mixing ethanol into petrol at the depot rather than at the pump ::PULLQUOTE:: The rule change does not give India a new fuel so much as it gives manufacturers a legal door to walk through. The fuel itself is still at a handful of pumps. ::PROS:: Domestically produced ethanol cuts crude oil imports and supports sugarcane and maize farmers High-ethanol blends produce near-zero particulate matter, which matters for Indian air quality Flex-fuel cars give buyers a genuine choice of fuel rather than locking them to one grade ::CONS:: There is no nationwide E100 rollout date and very few pumps sell it Ethanol's lower energy content means higher consumption per kilometre Only one flex-fuel car is on sale, so most buyers have nothing to choose from yet ::SOURCES:: MoRTH notification G.S.R. 911(E) and PIB release of 26 October 2026; NDTV Auto explainer; The Hindu explainer; NDTV Profit; Business Today