E15+ blended petrol has been in widespread use for over three-and-a- a-half years and E19-E20 fuel for over two-and-a-half years. New Delhi: Petrol blended with 20 per cent ethanol (E20) can reduce fuel economy by 2 to 6 per cent depending on the vehicle category and vintage, Road Transport and Highways Minister Nitin Gadkari informed Parliament on Thursday. The Union Minister, however, argued that tests for engine durability on a dynamometer and on-road vehicle tests have not shown any failures due to E20. In a written reply to the Lok Sabha, Gadkari said E20 fuel provides better acceleration, improved ride quality and approximately 30 per cent lower carbon emissions compared to E10 fuel. According to him, E15+ blended petrol has been in widespread use for over three-and-a- a-half years and E19-E20 fuel for over two-and-a-half years.