India has fast-tracked the nationwide rollout of E20 fuel - petrol blended with 20% ethanol - years ahead of schedule. The policy aims to reduce oil imports, cut emissions and make use of surplus sugarcane. But the move has sparked concern among motorists. Drivers and experts report lower fuel efficiency, while owners of older cars, motorcycles and vintage vehicles warn that E20 may accelerate corrosion and damage components not designed for higher ethanol content. Critics say consumers need clearer information and a greater variety of low-ethanol fuel options. We also examine what India can learn from Brazil's gradual ethanol strategy and ask whether E20 should be the limit as the country balances energy security, sustainability and the future of transport.