The central government has acknowledged that it has not formally assessed how many vehicles in India are compatible with E20 petrol, despite mandating E20 fuel nationwide and continuing to prepare for higher ethanol blends. The government, however, said laboratory studies and field trials have established the fuel's safety under prescribed standards.
In a written reply in the Rajya Sabha, Minister of State for Petroleum and Natural Gas Suresh Gopi said the Ministry of Heavy Industries had not assessed the percentage of vehicles in the country that are compatible with E20 fuel.
- Government cites laboratory and field trials to support E20 rollout
- Mileage drop for E10-calibrated vehicles pegged at 3-5 percent
- No verified evidence of widespread E20-related engine failures, says Centre
However, the government's latest response also raises questions over the rollout timeline. While the Centre formally announced nationwide availability of E20 petrol in mid 2025—five years ahead of its original 2030 target—it now says E19-E20 blends have been in widespread use for more than two-and-a-half years, while E15 and higher ethanol blends have been in active distribution for over three-and-a-half years, covering more than 20 crore two-wheelers and 3 crore petrol passenger vehicles. The response does not explain this apparent discrepancy.
Government reiterates mileage and reliability claims
Addressing concerns around fuel economy, the government said vehicles originally calibrated for E10 petrol could see a 3-5 percent reduction in mileage when running on E20, although actual fuel efficiency depends on driving conditions, driving style and vehicle maintenance.
The government also reiterated that there is no verified evidence of widespread engine failures or vehicle breakdowns linked to ethanol blending.
Government cites laboratory and field testing
According to the government, the Ethanol Blended Petrol (EBP) programme was implemented through a phased process involving NITI Aayog, oil marketing companies, automobile manufacturers, the Automotive Research Association of India (ARAI), the Society of Indian Automobile Manufacturers (SIAM) and the Indian Institute of Petroleum (IIP).
The government said testing covered engine durability, drivability, startability, corrosion resistance, material compatibility, emissions and fuel efficiency. Based on these studies, it said legacy vehicles do not show any significant change in performance or abnormal component wear when operated on E20 petrol.
Government preparing for higher ethanol blends
The government said India's ethanol production capacity has been planned to meet current E20 requirements while also supporting future petrol demand, higher ethanol blends, flex-fuel vehicles and other biofuel applications, subject to future government approvals. It added that ethanol production continues to follow a diversified feedstock strategy, with only surplus foodgrains being diverted after meeting food security and public distribution requirements.
Dipan Sur
Saptarshi Mondal
Viraaj Bhatnagar
Suraj Viswanathan
