E row Karnataka stands by ethanol claim questions oil firms explaination. If ethanol blending is automated, how can excess levels be limited to a few outlets? Karnataka minister Rizwan Arshad has challenged oil companies' explanation as the row over petrol testing deepens. Karnataka's minister Rizwan Arshad has accused oil marketing companies of exceeding the legal ethanol blending limit in petrol. He claims that tested samples showed blending levels as high as.