The government on Saturday said E20 petrol alone cannot be blamed for changes in vehicle mileage, stressing that real-world fuel efficiency is influenced by several factors ranging from driving habits and traffic conditions to vehicle maintenance and air-conditioning use. The clarification from the Ministry of Petroleum and Natural Gas comes amid continuing concerns among motorists over the impact of petrol containing 20 per cent ethanol on mileage, vehicle performance and compatibility, particularly in older vehicles.
The ministry said mileage depended on more than the fuel being used, pointing to driving behaviour, traffic, maintenance of the vehicle, tyre pressure and use of air conditioning as factors affecting fuel consumption.
It said E20 had undergone extensive testing and validation and argued that variations experienced by motorists in everyday conditions could not automatically be attributed solely to the ethanol blend.
The government's position, however, does not mean that E20 has no impact on fuel economy. The Centre had earlier informed Parliament that some older vehicles originally designed for E10 petrol could experience a fuel-efficiency reduction of around 3-5 per cent when running on E20.
The Automotive Research Association of India (ARAI) has also said that extensive vehicle testing covering 40,000-60,000 km showed minimal impact on fuel efficiency and no significant adverse effects on long-term engine health under validated conditions.
E20 consists of 80 per cent petrol and 20 per cent ethanol. From April 2026, all BS-VI vehicles are required to meet E20 emission standards, while petrol sold across the country has moved to the 20 per cent ethanol blend.
The clarification comes amid a broader debate over both mileage and fuel quality.
Recent reports based on internal automobile industry communications indicated that carmakers had raised concerns over chloride and moisture levels detected in some fuel samples collected across several states. The findings prompted questions over whether contamination during storage and distribution, rather than ethanol blending itself, could be contributing to some vehicle problems.
The government and oil marketing companies have pushed back against suggestions of widespread contamination. Authorities have said inspections have been conducted at around 90,000 fuel stations as part of efforts to monitor fuel quality.
The Petroleum Ministry has maintained that E20 is technically compatible with petrol vehicles and that consumer complaints are monitored by oil marketing companies, with corrective measures taken where required.
The Centre has strongly backed ethanol blending as part of its strategy to reduce India's dependence on imported crude oil, support domestic agriculture and cut emissions.
The latest clarification seeks to distinguish between the inherent characteristics of E20 and the numerous real-world variables that determine the mileage motorists ultimately get from their vehicles.