India’s transition to E20 ethanol-blended petrol was built on years of scientific testing, industry consultations and field validation, the Petroleum Ministry said on Friday, while acknowledging that some vehicles may see a 3-5 per cent drop in fuel economy.
Responding to concerns around ethanol-blended fuel, the ministry said the debate should not be reduced to mileage alone. It argued that E20 delivers several advantages, including a higher octane rating, improved anti-knock properties, cleaner combustion, smoother acceleration and reduced lifecycle carbon emissions.
E20 rollout backed by years of consultations
The ministry said India’s move from E10 to E20 followed an extensive consultation process involving automobile manufacturers, component suppliers, testing agencies, research institutions and technical experts.
It noted that manufacturers had already been engaged during the transition to E10 as early as 2020-21. The roadmap for E20 blending was placed in the public domain in 2021 after deliberations under the Inter-Ministerial Committee (IMC).
According to the ministry, every major aspect of vehicle performance was assessed before implementation. These included engine calibration, material compatibility, fuel systems, durability, drivability, emissions and fuel efficiency.
The government also held multiple rounds of consultations with stakeholders before introducing E20 nationwide.
“Had automobile manufacturers not been fully satisfied with the results, they would never have stood behind the product or honoured vehicle warranties. The fact that virtually every manufacturer today is honouring warranty for all vehicles (old or new) is because they have been part of the consultation,” the ministry said.
Ministry cites industry experience
The Petroleum Ministry pointed to field data from leading vehicle manufacturers to counter concerns over engine damage.
It said Maruti Suzuki serviced 2.84 crore vehicles during FY 2025-26, including 1.5 crore older vehicles that were not E20-certified, without reporting E20-related corrosion, abnormal wear or reduced component life.
Hero MotoCorp has also reported similar field experience, the ministry said, adding that such large-scale operational data carries greater weight than isolated anecdotes.
Ethanol blending programme began before current government
The ministry also rejected suggestions that India’s ethanol blending programme was conceived by the present government or introduced hastily.
It said the initiative dates back to a pilot programme launched in 2001. Ethanol blending was formally announced in 2004, while E5 fuel was introduced across several states by 2006. The policy framework was later notified in the Gazette of India in January 2013 during the UPA government.
Despite those early efforts, ethanol blending remained around 1.5 per cent until 2014, according to the ministry.
It said the key challenge at the time was limited ethanol production capacity, which depended largely on seasonal sugarcane output.
Investments expanded ethanol capacity
The ministry said the National Policy on Biofuels, introduced in May 2018, helped create the ecosystem needed to scale ethanol production.
It said multiple ministries coordinated efforts to expand feedstocks, improve logistics, support technology and encourage investment.
A major step came in August 2021 when Indian Oil Corporation (IOCL), Bharat Petroleum Corporation Limited (BPCL) and Hindustan Petroleum Corporation Limited (HPCL) invited proposals to establish Dedicated Ethanol Plants in ethanol-deficit regions.
The projects included long-term purchase agreements with oil marketing companies and financing arrangements involving public sector banks to reduce investment risks.
The ministry said public sector banks have financed investments of nearly Rs 1 lakh crore annually in ethanol production and related infrastructure over recent years.
Dedicated ethanol plants, storage facilities, distilleries and logistics networks have since been developed to support the country’s blending targets.
Ministry urges consumers not to rely on misinformation
The ministry advised consumers against relying on misinformation or unverified social media content about ethanol-blended fuel.
It said ethanol and blended petrol comply with Bureau of Indian Standards (BIS) specifications and undergo quality checks throughout the supply chain.
“Any procedural lapse anywhere in the supply chain should be dealt with firmly. Chief Secretaries of the states have been requested to ensure strict enforcement and take an iron hand against any instance of adulteration. There can be zero tolerance for lapses that compromise fuel quality,” the ministry said.