Petrol price was today hiked by 83 paisa a litre and diesel by Rs 1.26 per litre, the second increase in rates this month. Petrol in Delhi will cost Rs 63.02 per litre from midnight tonight, while a litre of diesel will cost Rs 51.67, said Indian Oil Corporation (IOC), the nation’s largest fuel retailer. Rates were last hiked by Rs 1.06 a litre on petrol and Rs 2.94 a litre on diesel on May 1.