Overview

Ethanol petrol is most likely already in your tank. Across India the standard grade now mixes crop-based alcohol into petrol, and most drivers never notice the change. That quiet shift replaced a fifth of the country's imported fuel with alcohol grown on Indian farms. As the apex distillers' body since 1953, the All India Distillers Association (AIDA) represents the producers who supply it. Here is a plain guide to the fuel and the terms that surround it.

What ethanol petrol is?

Ethanol petrol is petrol with dehydrated alcohol mixed in before sale. The proper name is ethanol blended petrol, and the grade most widely sold is E20. The label tells you the share of alcohol, so E20 means 20 percent ethanol and 80 percent petrol.

That share is the petrol ethanol content, the part of every litre that came from a crop rather than crude oil. As the petrol ethanol content rose over the past decade, ethanol blended petrol became the default at most outlets, which is why the fuel is now so common.

The fuel ethanol inside ethanol petrol

The alcohol mixed into the fuel is fuel ethanol, dried until it is nearly water free so it stays stable in the tank. Oil companies buy this fuel ethanol from distilleries under fixed contracts, then mix it at depots before sale.

Because it powers engines, the same input is also called ethanol fuel. A steady supply of ethanol fuel from sugarcane, maize and surplus grain is what let India reach E20 without shortages, turning farm output into road fuel.

Is ethanol petrol safe for your vehicle

Most vehicles sold in India in recent years are built to run on ethanol petrol up to E20. Manufacturers have confirmed both material compatibility and engine tuning, and E20-ready engines have been phased in since 2023.

Older vehicles can still use it, though they may show a small mileage drop. Government-backed studies place that change between roughly one and six percent depending on the vehicle. For everyday driving, the practical effect is modest.

Automotive and transport grades behind the pump

The alcohol used is automotive ethanol, made to clear tight purity rules before it touches a vehicle. Keeping the automotive ethanol clean protects fuel systems and stops the mixture separating inside the tank.

To travel long distances and fire reliably, the alcohol must qualify as transport-grade ethanol. The Bureau of Indian Standards sets the specification for transport-grade ethanol, which keeps ethanol petrol consistent from one state to the next.

Why ethanol petrol matters and what comes next

The case for the fuel rests on hard numbers. Over eleven years, ethanol blending saved more than Rs 1.6 lakh crore in foreign exchange and avoided around 832 lakh tonnes of carbon dioxide, per figures shared in Parliament in December 2025.

With E20 achieved, ethanol blending is now turning toward higher grades and flex-fuel vehicles. The Bureau of Indian Standards has been preparing specifications above E20, a sign that ethanol petrol still has room to grow well beyond a fifth of the tank.

KEY TAKEAWAYS

• Ethanol petrol is petrol mixed with crop-based alcohol, sold mainly as E20 with a petrol ethanol content of 20 percent.
• The alcohol used is fuel ethanol, also called ethanol fuel and automotive ethanol, dried to a strict transport grade.
• Most recent Indian vehicles are E20 ready, while older ones may see a one to six percent mileage change.
• Over eleven years, ethanol blending saved more than Rs 1.6 lakh crore in foreign exchange.
• Higher grades and flex-fuel vehicles are the next step beyond E20.

FREQUENTLY ASKED QUESTIONS

Q1. What is ethanol petrol?

Ethanol petrol is petrol that has crop-based alcohol mixed in before sale, properly called ethanol blended petrol. The most common grade in India is E20, which has a petrol ethanol content of 20 percent. The alcohol used is fuel ethanol made from sugarcane, maize and surplus grain, dried for use in engines.

Q2. Is ethanol petrol safe for my car?

Ethanol petrol up to E20 is safe for most vehicles sold in India in recent years, since manufacturers have confirmed compatibility. Older vehicles can still use it but may see a small mileage drop of around one to six percent. The automotive ethanol used meets strict purity standards as transport-grade ethanol.

Q3. Does ethanol petrol give lower mileage?

Ethanol petrol can give a slightly lower mileage because the alcohol holds a little less energy per litre than petrol. Government-backed studies place the change between roughly one and six percent, depending on the vehicle's age and tuning. Newer E20-ready vehicles experience the smallest difference in everyday driving.

Q4. How much ethanol is in ethanol petrol today?

Ethanol petrol in India is now sold mainly as E20, meaning a petrol ethanol content of about 20 percent. The country reached this average during Ethanol Supply Year 2024 to 2025, roughly five years ahead of the original 2030 target, after steadily raising the share through the national ethanol blending programme.

ABOUT AIDA

AIDA, the All India Distillers' Association, has been the voice of Indian distilleries since 1953 and is recognised as the apex national body for ethanol, bioenergy and potable alcohol. Its members hold more than 80 percent of the country's distillation capacity. Read more across the cluster at aidaindia.org.