- Why in news
- On 26 October 2026, MoRTH said it has notified amendments to the Central Motor Vehicles Rules, 1989, expressly including E100 alongside E85 in emission certification for flex fuel vehicles.
- What it is
- The Central Motor Vehicles Rules, 1989 are subordinate rules under the Motor Vehicles Act, 1988. They cover vehicle registration, construction, equipment, safety and emission standards. MoRTH amends them through Gazette notifications to bring in new vehicle and fuel technologies.
- Rules amended
- The Central Motor Vehicles Rules, 1989 were amended by MoRTH to support flex fuel vehicles using E85 and other high ethanol fuels.
- E100 added
- Emission certification provisions now expressly include E100 alongside E85.
- Meaning of E85
- E85 is a petrol-ethanol blend with up to 85 per cent ethanol by volume. The number shows the ethanol share.
- Commencement
- The rules take effect from the date of publication in the Official Gazette.
- Parent law
- The CMVR are framed under the Motor Vehicles Act, 1988.
Don’t confuse with E20 vs E85/E100: E20 is a 20 per cent ethanol blend for general vehicles. E85/E100 is only for vehicles specially designed and certified for it.
Don’t confuse with Flex fuel vehicle vs E20-compatible vehicle: A flex fuel vehicle is designed for a range of blends in one tank. An E20-compatible vehicle is not necessarily fit for high ethanol blends.
Laws, judgments and statutory bodies: 30 Prelims questions since 2013 (what the law says, who chairs, legal basis). In Mains, 44 news-triggered questions, most in GS2, asking for provisions and challenges.
Why it matters
- Gives a legal certification route for flex fuel vehicles, supporting India's ethanol blending push.
- Greater use of domestic ethanol can reduce dependence on imported crude oil.
Problems
- Limited availability of E85/E100 at fuel stations and risk of misfuelling in incompatible vehicles.
- Ethanol feedstock questions and the cost of vehicles with ethanol-specific components.
Way forward
- Expand E85/E100 supply and clear labelling, with public awareness on fuel compatibility stickers.
- Align incentives for manufacturers and sustainable feedstock sourcing.
Put in your answer
Compatibility safeguard: The release says E85/E100 applies only to specifically designed and certified vehicles, with no mandate on existing owners.
Global precedent: Flex fuel technology is already used in Brazil and the United States.
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UPSC’s own questions that come close to this issue, from our Prelims and Mains banks.
Prelims practice · Single answer
Ours, not from a UPSC paper
Consider the following statements about the recent amendments to the Central Motor Vehicles Rules, 1989 on flex fuel vehicles:
- 1.The amendment expressly includes E100 alongside E85 in the emission certification provisions.
- 2.The notification requires owners of existing petrol vehicles to modify them to run on E85 within a notified period.
- 3.A vehicle compatible with E20 is automatically suitable for E85.
- 4.The amended rules come into force only after a fixed transition period of one year from notification.
Which of the statements given above is/are correct?
True or false?
1 of 6
Statements the way Prelims prints them. Say first, then see the fact.
1.E85 is a blend containing up to 85 per cent ethanol by volume.
True. The number in E85 shows the ethanol proportion.
2.The notification requires owners of existing petrol vehicles to modify them to run on E85 within a notified period.
False. It does not require existing owners to switch or modify their vehicles.
3.A vehicle that is compatible with E20 is automatically suitable for E85 under the notification.
False. Compatibility with E10 or E20 alone does not establish suitability for E85.
4.The Central Motor Vehicles Rules, 1989 are framed under the Motor Vehicles Act, 1988.
True. The CMVR are subordinate legislation under the Motor Vehicles Act, 1988.
5.The amended rules come into force only after a fixed transition period of one year from notification.
False. They take effect from the date of publication in the Official Gazette.
6.The notification also updates biodiesel-related provisions and makes technical corrections.
True. Biodiesel provisions were updated along with technical corrections.
Written by us from the release, not by UPSC; checked by a second model.
Worth revising until Prelims 2028: most news questions come within two years of the event.