New Delhi: The Union government is likely to postpone the rollout of petrol blended with 25% ethanol (E25) following growing concerns from consumers, automobile manufacturers, and other stakeholders over the rapid transition to higher ethanol-blended fuels. The move comes amid widespread criticism of the government’s accelerated shift from E10 to E20 petrol, with motorists reporting lower fuel efficiency and apprehensions about the impact on older vehicles.
According to government sources, the Centre is now considering a more gradual and calibrated approach to introducing E25 fuel, which consists of 75% petrol and 25% ethanol. Officials believe that additional time is required to ensure the automotive ecosystem is adequately prepared before increasing ethanol content further.
The government had originally planned to make E20 petrol the nationwide standard only by 2030. However, the transition was completed nearly five years ahead of schedule, with E20, containing 80% petrol and 20% ethanol, now available across the country. While the move was hailed as a major milestone in India’s clean energy and fuel-import reduction strategy, it has also sparked criticism from a section of consumers who claim they have experienced reduced vehicle mileage and potential mechanical issues, particularly in older vehicles not specifically designed for higher ethanol blends.
Speculation over the government’s intention to move quickly towards E25 intensified in recent weeks after two significant policy decisions. The Centre announced central excise duty exemptions for fuels containing between 22% and 30% ethanol, while the Bureau of Indian Standards (BIS) also notified fuel quality standards for these higher ethanol blends. These developments were widely interpreted as preparations for the next phase of India’s ethanol blending programme.
However, government officials have indicated that these steps should not be viewed as an immediate signal of an E25 rollout. Instead, recent discussions at the highest levels of government have highlighted the need to address consumer concerns through scientific evaluation and broader stakeholder consultations before any further increase in ethanol blending.
Sources familiar with the deliberations said senior officials acknowledged that some public concerns are genuine and require careful examination, while others may be exaggerated. During a high-level meeting held last week, officials reportedly stressed the importance of working closely with original equipment manufacturers (OEMs) to better understand complaints related to mileage reduction, engine performance, and vehicle compatibility.
The concerns surrounding higher ethanol blends are rooted in the chemical properties of ethanol itself. Ethanol contains lower energy content than conventional petrol, resulting in a noticeable decline in fuel economy. While vehicles designed for E20 fuel can compensate to some extent through engine calibration, older vehicles originally certified for E10 petrol often experience a greater reduction in mileage.
Experts also point out that higher ethanol concentrations can affect cold-start performance because ethanol requires a higher temperature for combustion than petrol. As a result, vehicles running on higher ethanol blends may become more difficult to start during colder weather conditions.
Another significant concern involves the long-term durability of vehicle components. Ethanol is hygroscopic, meaning it readily absorbs moisture from the atmosphere. Increased water absorption can contribute to corrosion in fuel systems, especially in older vehicles whose components were not engineered for prolonged exposure to higher ethanol concentrations. This has prompted automobile manufacturers to seek more time for engineering improvements before E25 becomes widely available.
Automakers are currently working on redesigning engines with higher compression ratios to maximise the efficiency of higher ethanol blends while also improving fuel system durability, corrosion resistance, and material compatibility. However, these technological upgrades require extensive engineering, testing, validation, and homologation, the regulatory certification process that ensures vehicles comply with safety, environmental, and performance standards.
Despite these challenges, the government continues to emphasise the long-term benefits of expanding ethanol blending. Ethanol has a lower carbon footprint than petrol, helping reduce greenhouse gas emissions from the transport sector. It also possesses a higher octane rating, improving resistance to premature combustion and enhancing engine performance when vehicles are specifically designed for higher ethanol content.
Perhaps most importantly, increasing domestic ethanol production supports India’s broader energy security objectives by reducing dependence on imported crude oil while providing additional income opportunities for the country’s agricultural sector, particularly sugarcane farmers who supply much of the feedstock used in ethanol production.
Officials have reiterated that any future transition to E25 fuel will only take place after comprehensive testing, industry readiness assessments, and consultations with all stakeholders.
