A national debate has been raging over the impact of 20% ethanol-blended petrol (E20) on the engines and fuel efficiency of vehicles not designed to run on such fuel, with many consumers demanding either a rollback of the programme or the option to buy petrol with a lower or zero ethanol blend.

Indian gas stations now only offer fuel with 20 percent ethanol blended in. But the rushed move has triggered criticism.

A national debate has been raging over the impact of 20% ethanol-blended petrol (E20) on the engines and fuel efficiency of vehicles not designed to run on such fuel, with many…