Government Notifies Standards for Higher Ethanol Blends Up to E30

The Indian government has notified new standards for ethanol-petrol blends over the existing E20 - E22, E25, E27, and E30. The Bureau of Indian Standards (BIS) published the new standard (IS 19850:2026) on May 15.

This step aims to use surplus ethanol, reduce crude oil imports amid West Asia conflicts, save foreign exchange, cut emissions, and support farmers. The standard sets technical rules for mixing anhydrous ethanol with petrol, including composition, impurities, testing methods, and safety norms.

Petrol pumps will clearly label these new blends, so vehicle owners can know what exact fuel they are getting filled.

Higher blends are not mandatory yet, but this move provides a framework for gradual rollout as vehicles and ethanol supply become ready.

Also Read - A List Of All The E20 Compatible Cars On Sale
 

Ethanol Blending Concerns for Current Vehicle Owners

Many of you are likely worried about the impact on your petrol cars or bikes that are only compatible up to E20, or maybe even lesser. This is a valid concern, as E20 has already led to mileage drops and compatibility issues.

Higher blends may cause a further drop in mileage beyond what many already see with E20. Ethanol can affect rubber seals, gaskets, and fuel system parts in older cars.

Most Fully E20-compliant cars only started rolling out after April 2025, meaning that majority of existing vehicles on the road are only E10 compliant.

Using blends above E20 may raise questions on warranty and engine life. Manufacturers may deny warranty in such cases.

To address these, the Petroleum Ministry has asked the Automotive Research Association of India (ARAI) to study E10 and E20 compliant vehicles, monitoring their performance, mileage, emissions, engine life, and costs. Samples may be tested for 60,000-70,000 km to obtain accurate results.

Experts note that a small increase (like 1% above E20) is unlikely to cause major issues, but a jump to 25% could start showing its effects and needs careful assessment.

Owners are advised to continue using E20 for now, maintain their cars properly with regular servicing, and follow manufacturer advice.

Also Read - A Full List Of E20 Compliant Bikes and Scooters in India
 

What do E22, E25, E27 and E30 Mean?

E stands for Ethanol. The number after E shows the percentage of ethanol mixed with petrol. 

So, E20 means 20% ethanol and 80% petrol. Similarly, E22 has 22% ethanol, E25 has 25%, E27 has 27%, and E30 has 30% ethanol blended with petrol.

E100 is 100%, or nearly pure ethanol.

Also Read - Maruti Suzuki's First E100 Flex-Fuel Vehicle To Be Revealed on June 5
 

Advice for Potential Car Buyers

Those of you who are planning to buy a new car or bike are advised to check their level of ethanol compatibility. Vehicles made after April 2025 are expected to be E20 compliant.

Ask dealers about the vehicle's readiness for higher blends like E25 or E30. Some companies are already developing flex-fuel vehicles. Consider possible effects on mileage and power, but also note benefits like better octane rating.

Source: Times of India