Chennai, Nov 7 (UNI) The three public sector Oil Marketing Companies (OMCs), Indian Oil Corporation Limited (IOCL), Bharat Petroleum Corporation Limited (BPCL) and Hindustan Petroleum Corporation Limited (HPCL) on Saturday reaffirmed the E20 fuel quality standards and questioned the testing methodology behind the Karnataka government's claim. A joint statement issued by the three psus said they have taken note of the press release issued by the Karnataka Department of Food, Civil Supplies, Consumer Affairs and Legal Metrology, claiming that petrol sold at certain retail outlets in the State contains between 26% and 31% ethanol. The OMCs clarified that the claims,…