Petrol and diesel rates were hiked in metros on Friday, with diesel remaining costlier than petrol in Delhi for a third straight day. With the latest hike, diesel prices have been increased for 20 days in a row, ever since state-owned oil companies returned to the normal practice of daily reviews following a 12-week hiatus. In the national capital, the price of petrol was increased to Rs 80.13 per litre with effect from 6 am from Rs 79.92 per litre, and the rate of diesel was raised to Rs 80.19 per litre from Rs 80.02 per litre, according to notifications from state-run Indian Oil Corporation, the country's largest fuel retailer.