Petrol price cut by Rs 3.77 per litre, diesel by Rs 2.91 a litre. Petrol will now cost Rs 66.29 a litre in Delhi as compared to Rs 71.14 per litre, Indian Oil Corp, the nation’s largest fuel retailer, announced. Similarly, diesel will cost Rs 55.61 per litre as against Rs 59.02 a litre currently.