New Delhi: Petrol price was hiked by Rs.2.58 a litre and diesel by Rs.2.26 per litre, an announcement from Indian Oil Corp. (IOC) said here late on Tuesday. Petrol will cost Rs.65.60 per litre in Delhi after the increase while diesel will cost Rs.53.93 a litre. Petrol prices in Kolkata will be Rs.68.46 per litre, in Mumbai it will be Rs.70.18 per litre while in Chennai one litre petrol will cost Rs.65.04. The new rates will be applicable from the mid night of May 31/June 1, the announcement said. The prices were last hiked on May 17.