Petrol price was on Wednesday, marginally hiked by 5 paise a litre and diesel by Rs 1.26 a litre, the fourth increase in rates in six weeks. Petrol will cost Rs 65.65 a litre in Delhi from midnight, as compared to Rs 65.60 per litre currently, Indian Oil Corp, the nation’s largest fuel retailer, announced. Similarly, diesel will cost Rs 55.19 per litre as against Rs 53.93 a litre currently. “The current level of international product prices of petrol and diesel and Rupee-US Dollar exchange rate warrant increase in selling price of petrol and diesel, the impact of which is being passed on to the consumers with this price revision,” IOC said in a statement. The movement of prices in the international oil market and Rupee-USD exchange rate shall continue to be monitored closely and developing trends of the market will be reflected in future price changes, IOC added.