India's government has confirmed that E20 petrol, a blend of 20% ethanol and 80% petrol, can reduce mileage by up to 5% in some vehicles. The drop happens because ethanol has less energy content than conventional petrol. Officials say the impact varies by vehicle model, engine design, and driving habits. Newer cars built for E20 compatibility should see minimal issues, while older models may need a check with the manufacturer. The trade off is cleaner combustion and lower tailpipe emissions. Ethanol burns more efficiently than petrol, which helps reduce the transport sector's carbon footprint. The government also points to energy security: more domestic ethanol means less imported crude oil and a smaller fuel import bill. The policy supports rural economies by creating demand for agricultural feedstock used in ethanol production. For drivers, the key takeaway is that the 5% mileage drop is not universal. It depends on the vehicle and how it is driven. The government says the long term benefits lower emissions, reduced oil dependence, and stronger energy security outweigh the short term efficiency loss. This is a practical trade off that many countries are weighing as they push higher ethanol blends.
