BENGALURU: Karnataka chief minister DK Shivakumar Sunday asserted that investigations into excessive ethanol blend — more than 30% against the prescribed 20% — in fuel stations in the state. CM Shivakumar says samples have been tested at 67 locations; oil companies have disputed state's earlier. Karnataka’s ethanol blending probe covers fuel units after petrol samples allegedly showed levels above 30%, with a report due Monday.