Government likely to delay E25 fuel rollout amid backlash over rapid ethanol blending

New Delhi: The Centre is likely to adopt a calibrated approach to the proposed rollout of E25 petrol, a fuel blend containing 25 per cent ethanol, amid growing concerns over vehicle performance, fuel efficiency and ecosystem readiness following the rapid nationwide transition to E20. The government had originally planned to introduce E20 petrol by 2030. However, the target was achieved well ahead of schedule, with E20 now becoming the standard petrol variant across the country. Although no timeline has been announced for the next phase, two recent policy decisions fuelled speculation that preparations for E25 had begun. These include an excise duty exemption for petrol blended with 22-30 per cent ethanol and the notification of fuel quality standards for such blends by the Bureau of Indian Standards (BIS). The developments raised concerns among automobile manufacturers and motorists, particularly as some consumers have reported lower fuel efficiency and apprehensions over the long-term impact of higher ethanol blends on older vehicles after the shift to E20. Government sources said a recent high-level meeting reviewed these concerns and stressed the need to scientifically examine genuine consumer complaints while ensuring that manufacturers address issues related to vehicle performance. Officials are understood to believe that the transition beyond E20 should be gradual, giving sufficient time for vehicle manufacturers, fuel suppliers and consumers to adapt. "There is a view within the government that the transition beyond E20 will need to be spaced out. The idea is to move to E25 in a calibrated, graded manner for existing vehicles," a senior government official said. Why E25 is raising concerns Automobile manufacturers have expressed reservations about a quick shift to E25, especially after the accelerated transition from E10 to E20. Higher ethanol blends generally reduce fuel economy because ethanol has a lower calorific value than petrol. The impact is more significant in older vehicles that were originally designed to run on E10 fuel. Industry experts have also highlighted concerns over corrosion, fuel-system durability and material compatibility, as ethanol absorbs moisture more readily than petrol. Older engines may also experience harder cold starts and increased wear if operated regularly on higher ethanol blends without suitable modifications. The proposed E25 transition will require manufacturers to undertake additional engineering work, including engine recalibration, durability testing, corrosion resistance validation, material compatibility assessments and fresh homologation before vehicles can be certified for the higher blend. Balancing green goals with consumer confidence The Centre has been promoting ethanol blending to reduce crude oil imports, improve energy security and lower carbon emissions. Ethanol also offers a higher octane rating, enabling better engine performance when vehicles are specifically designed for higher blends. Several automobile manufacturers are already developing engines optimised for higher ethanol blends with improved compression ratios. However, these technologies are largely intended for future vehicle platforms rather than the existing fleet. Officials indicated that any move beyond E20 will be preceded by adequate testing, stakeholder consultations and sufficient time for the automotive ecosystem to prepare, suggesting that the transition to E25 will be phased rather than rushed.