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E20 Petrol: Vehicle Compatibility, Mileage and Warranty
E20 is petrol blended with 20% ethanol. India's average blending reached 20% in 2025-26. The manufacturer decides which blend your vehicle can take and must show it on a sticker on the vehicle. The government says older vehicles can use E20, with a mileage drop of about 3–5% in some E10-designed vehicles, and that warranties and insurance stay valid. Questions about damage and mileage have been raised in Parliament, so this page separates what the government says from what is still argued.
- Blend
- 20% ethanol, 80% petrol
- Fuel standard
- BIS IS 17021:2018
- Vehicle label
- Sticker on the vehicle (GSR 156(E), 2021)
- Mileage drop (official)
- About 3–5% in some vehicles
- Blending 2025-26
- 20% (Nov–June)
On this page
What is E20 petrol?
E20 is petrol with 20% ethanol blended in. The number after the E is the share of ethanol: E10 has 10%, E85 has 85%, E100 is pure ethanol. Ethanol in India is made mainly from sugarcane products, maize and surplus or damaged foodgrains.
- Fuel standard: E20 sold as a commercial fuel must meet the BIS specification IS 17021:2018.
- Vehicle rules: the Transport Ministry (MoRTH) notified emission standards for E20 vehicles in GSR 156(E) of 8 March 2021, and safety rules for ethanol vehicles (rule 115K) in GSR 343(E) of 25 May 2021.
- Octane: the Petroleum Ministry says ethanol's octane number is about 108.5, against about 84.4 for petrol, and that E20 raises the octane (RON) of Indian petrol to about 95.
- Who runs it: the Ethanol Blended Petrol Programme is run by the Ministry of Petroleum and Natural Gas (MoPNG) through the oil marketing companies.
What is the national ethanol blending timeline?
| When | What happened |
|---|---|
| 2001 | Pilot blending programme |
| 2006 | E5 rolled out in several states |
| 2013-14 | Average blending about 1.53% |
| 2018 (amended 2022) | National Policy on Biofuels; the 20% target moved forward from 2030 to the 2025-26 ethanol supply year |
| March 2021 | MoRTH notifies E20 emission standards and the vehicle sticker rule (GSR 156(E)) |
| June 2021 | NITI Aayog roadmap for ethanol blending, 2020-25 |
| June 2022 | E10 reached, five months ahead of schedule |
| February 2023 | E20 launched at 84 fuel outlets |
| 2023-24 | Average blending about 14.6% |
| 2024-25 | Average blending about 19.2% |
| 2025-26 (Nov–June) | Average blending 20% |
Beyond E20: in August 2025 the Petroleum Ministry said the roadmap commits to E20 up to 31 October 2026, and that any higher blend needs a committee report, consultation and a government decision, which had not yet been taken. We found no later official decision.
Which vehicles are E20-compliant?
Under GSR 156(E), the manufacturer decides which ethanol blend a vehicle is compatible with, and must show it on the vehicle with a clearly visible sticker. We found no government list of compliant models; the sticker, the owner's manual and the manufacturer are the places to check.
Vehicle made from April 2023
- The 2021 NITI Aayog roadmap planned for E20 material-compliant vehicles (E10-tuned engines) across the country from April 2023, and vehicles with E20-tuned engines from April 2025.
- That was a roadmap, not a guarantee for every model. Look for the E20 sticker or the fuel line in the owner's manual.
- For vehicles designed for E10 and tuned for E20, the roadmap estimated a mileage loss of only 1–2%.
Vehicle made before April 2023
- Your manual may say E10 compatible. The Petroleum Ministry says a manual reflects the fuel standard that existed when the vehicle was certified, not a ban on E20.
- The Transport Ministry told Lok Sabha (July 2026) that tests by IOCL, IIP Dehradun, SIAM and ARAI on BS-III, BS-IV and BS-VI petrol two- and four-wheelers found no need to modify engines, and no drivability, starting, metal or plastic compatibility issues.
- BS-III vehicles (from 1 April 2005 and made before 2016) may need some rubber parts and gaskets replaced, which the ministry says can be done during routine servicing.
- Ask your authorised service centre whether your model needs any part changed.
YouManufacturer / service centre
- Look for the ethanol compatibility sticker on the vehicle
- Does it say E20?No sticker or E10 only: check the fuel section of the owner's manual
- Note the year of manufacture and emission norm (BS-III, BS-IV or BS-VI)
- Ask the authorised service centre or manufacturer whether any part needs changing for E20
- Keep the written answer with your service records
✔ You'll know your vehicle is E20-compliant when the sticker, the manual or the manufacturer's written answer says so.
How much does E20 reduce mileage?
Ethanol carries less energy per litre than petrol, so mileage can drop. The official figures differ by vehicle and by who measured:
| Vehicle | Mileage drop | Official source |
|---|---|---|
| Car designed for E10, tuned for E20 | 1–2% | NITI Aayog roadmap, 2021 |
| Two-wheeler designed for E0, tuned for E10 | 3–4% | NITI Aayog roadmap, 2021 |
| Car designed for E0, tuned for E10 | 6–7% | NITI Aayog roadmap, 2021 |
| Some E10-designed vehicles | About 3–5% | MoPNG, Lok Sabha reply, July 2026 |
| Validated E20 vehicles in lab tests | 2–6% | ARAI, via Ministry of Heavy Industries, July 2026 |
- A widely shared "30%" figure is ethanol's lower energy content compared with petrol, not the real-world mileage drop, according to a PIB factsheet.
- The ministries say driving habits, servicing (oil and air filter), tyre pressure and wheel alignment, and air-conditioner use affect mileage as much as fuel does.
- To see your own figure, fill the tank fully twice and divide kilometres driven by litres filled; repeat over a few fills, as one tankful varies.
For a full running-cost comparison, see petrol vs EV cost.
Does E20 affect your warranty or insurance?
Warranty
- The Petroleum Ministry told Lok Sabha in July 2026 that manufacturers continue to honour warranty obligations for vehicles using E20.
- A PIB factsheet says the manufacturers' body SIAM confirmed that warranties will be honoured for vehicles running specification-compliant E20.
- Warranty terms are set by each manufacturer. If a claim is refused, ask for the reason in writing, and check your warranty booklet's fuel clause.
Insurance
- The Petroleum Ministry said in August 2025 that using E20 has no impact on the validity of vehicle insurance in India, and repeated in June 2026 that claims otherwise were found to be incorrect.
- We found no IRDAI circular on E20. Claims are decided under your policy wording, so read the exclusions.
- For how a motor claim works, see motor insurance claims.
What does the government say, and what is disputed?
The government's position comes from ministry press releases and replies in Parliament. Members of Parliament have asked about owners' complaints of engine damage, lower mileage, poor pick-up and tank rust, which shows the question is still argued. The table sets the two side by side. The government's statements are its own assessment; no independent public study of the whole vehicle fleet was found.
| Question | What the government says | What is disputed or not shown |
|---|---|---|
| Can older vehicles use E20? | Yes. Tests on BS-III to BS-VI vehicles found no abnormal wear; one carmaker's service data on about 1.5 crore vehicles not certified for E20 showed no E20 damage (MoPNG, July 2026) | Claims circulated that vehicles made before 2023 can't run on E20. The service data comes from the companies and is reported by the ministry, not published as a study |
| Engine damage | No verified evidence of widespread engine failure; over 20 crore two-wheelers and over 3 crore petrol cars have run on these blends | MPs asked about owners' protests over engine damage (Lok Sabha, July 2026) |
| Mileage | About 3–5% in some E10-designed vehicles; claims of a collapse are wrong | MPs asked about complaints of lower mileage and poor pick-up; the 2021 official estimate for E10-tuned cars was 6–7% |
| Rubber parts and rust | Only BS-III vehicles may need some rubber parts and gaskets changed; no E20-linked corrosion in the service data cited | MPs asked about complaints of tank rusting |
| Complaints | No widespread or substantiated complaints from manufacturers, associations or consumer groups | Concerns raised in the media and on social media, which the ministry says it examined |
| Is E20 an experiment? | No. The Attorney General's office said in June 2026 that it never called E20 an experiment in the Supreme Court; that case was about ethanol allocation | Media reports said otherwise; the government called them false |
What should you do if you think E20 caused a problem?
YouService centre / insurer / government
- Keep the fuel bills and note the pump, date and kilometres
- Take the vehicle to an authorised service centre and ask for a written diagnosis
- Covered by warranty?No: ask for the refusal reason in writing and check your policy
- The manufacturer repairs or replaces the part under warranty
- Unresolved with a government body: lodge a grievance on CPGRAMS
- Fuel bills, with pump name and date
- Kilometres at each fill, and the litres filled
- The sticker or manual page showing your vehicle's ethanol compatibility
- Service records and the written diagnosis
- Warranty booklet and insurance policy
- Any written refusal from the dealer or insurer
For grievances about central government services, use CPGRAMS; see how to escalate a complaint. Keep your PUC certificate valid as usual, whatever fuel you use.
Frequently asked questions
What does E20 mean?
Petrol with 20% ethanol and 80% petrol. The fuel must meet BIS standard IS 17021:2018.
How do I know if my vehicle is E20-compliant?
Check the ethanol compatibility sticker on the vehicle, then the owner's manual, then ask the manufacturer. Since 2021 the manufacturer must show compatibility with a clearly visible sticker.
My manual says E10. Can I use E20?
The Petroleum Ministry says the manual shows the fuel standard at the time of certification, and that tests found older vehicles can run on E20. BS-III vehicles may need some rubber parts changed. Ask your service centre about your model.
How much mileage will I lose?
Official figures range from 1–2% for vehicles tuned for E20 to 6–7% for older cars tuned for E10. The Petroleum Ministry's 2026 figure is about 3–5% for some vehicles.
Will E20 void my warranty?
The government says manufacturers continue to honour warranties for vehicles using E20. Check your warranty booklet, and ask for any refusal in writing.
Will my insurance claim be refused because I used E20?
The Petroleum Ministry says E20 has no impact on insurance validity. Claims still follow your policy wording.
Is E20 going to become E27 or E30?
No decision on going beyond E20 had been announced in the official statements we read.
Can I still buy E10 or ethanol-free petrol?
The 2021 roadmap planned E10 as a protection fuel for older vehicles. The official statements we read don't say whether it is still sold, so ask your fuel station.
Sources
- PIB (MoPNG) – Facts about ethanol blended petrol (30 Jul 2026): claims rebutted, blending by year (accessed 26 Oct 2026)
- PIB (MoPNG) – E20 rollout based on scientific validation (30 Jul 2026): testing, field data, warranty (accessed 26 Oct 2026)
- Lok Sabha unstarred question 892 (MoPNG, 23 Jul 2026): mileage 3–5%, warranty, complaints (accessed 26 Oct 2026)
- Lok Sabha unstarred question 904 (MoRTH, 23 Jul 2026): tests on BS-III to BS-VI vehicles, rubber parts (accessed 26 Oct 2026)
- PIB (MoPNG) – Ethanol Blended Petrol Programme Q&A (10 Jul 2026) and FAQ PDF: manuals, mileage, launch (accessed 26 Oct 2026)
- PIB factsheet – Ethanol blending in India (updated 12 Oct 2026): the "30%" figure, warranty, insurance (accessed 26 Oct 2026)
- PIB (MoPNG) – Response to concerns on 20% blending (12 Aug 2025): insurance, rubber parts, octane, beyond E20 (accessed 26 Oct 2026)
- PIB (MoPNG) – Misleading claims and old images (23 Jun 2026) (accessed 26 Oct 2026)
- PIB (Ministry of Heavy Industries) – ARAI on E20 validation (4 Jul 2026): 2–6% in lab tests (accessed 26 Oct 2026)
- PIB (Ministry of Law and Justice) – Attorney General's clarification (30 Jun 2026) (accessed 26 Oct 2026)
- PIB (MoPNG) – Ethanol blending beyond 20% (20 Mar 2025): E10 in June 2022, biofuel policy (accessed 26 Oct 2026)
- PIB (MoRTH) – Year end review 2021: GSR 156(E) sticker rule, GSR 343(E) (accessed 26 Oct 2026)
- PIB (MoRTH) – Draft E20 notification (18 Dec 2020) (accessed 26 Oct 2026)
- NITI Aayog – Roadmap for ethanol blending in India 2020-25 (June 2021): vehicle timeline, mileage estimates, IS 17021:2018 (accessed 26 Oct 2026)
Page history: 26 Oct 2026: first published.