E20 may lower mileage by 3-5% in some older vehicles, no widespread engine damage found: Govt

E20 petrol may cause a slight fuel economy reduction in older vehicles. Extensive testing has not found widespread engine damage linked to ethanol blending. Many older vehicles operate on E20 fuel without verified evidence of engine failure. Manufacturers continue to honor warranty obligations for vehicles using compliant E20 fuel. The government sees no proposal to revert to E0 or E10 petrol.