Owners complain that the fuel cuts their mileage, because ethanol carries less energy than petrol, so a car burns more of it to cover the same distance

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…