The much-awaited national roll out of Ethanol-blended patrol is fumbling. High taxes imposed on ethanol has made the blending unviable. The national roll-out plan was scheduled for November end but the blended fuel is now available only in parts of Uttar Pradesh, Maharashtra, Tamil Nadu and Goa. A by-product from sugar molasses, Ethanol is cheaper than petrol. As an additive to petrol, it helps the fuel burn better, thereby reducing emissions from vehicle exhaust. Studies have shown drastic reduction in carbon monoxide emissions from vehicles running on ethanol-blended patrol.