Karnataka minister Rizwan Arshad said state stands by its findings that petrol samples contained more than prescribed 20% ethanol, with some showing up to 31.2%. BENGALURU: Food and Civil Supplies Minister Rizwan Arshad on Monday said the state government stands by its report that oil marketing companies (OMCs). Karnataka minister Rizwan Arshad defended findings that oil marketing companies blended over 20 percent ethanol in petrol, risking engine damage.