Rules Out Parallel Fuel Supply SystemNEW DELHI: Govt Friday ruled out offering pure petrol, lower ethanol-petrol blends as options to E20 saying it won't be feasible, amid a debate and demand that people should have choice for 100% petrol and E10 as well. It also said E20 offers a higher-octane rating, superior anti-knock characteristics, faster combustion, better pickup, smoother acceleration and cleaner engine operation.In an official release, petroleum ministry said maintaining parallel nationwide supply chains would increase logistics costs and complicate distribution across more than one lakh retail outlets as it won't be feasible for petrol pumps to offer multiple fuel grades such as pure petrol, E10 and E20."Once a superior fuel has been scientifically validated, extensively tested