Oil marketing companies (OMCs) kept the petrol, diesel prices unchanged on Wednesday after increasing the rates consecutively for the last 10 days. However, the fuel prices still remain at an all-time high. Petrol is selling at a price of Rs. 79.31 per litre in Delhi, according to price notification of state-owned fuel retailers. A litre of petrol is retailing at Rs. 86.72 in Mumbai, Rs. 82.41 in Chennai and Rs. 82.22 in Kolkata. Diesel is vending today at a price of Rs. 71.34 in Delhi, Rs. 75.74 per litre in Mumbai, Rs. 75.39 per litre in Chennai and Rs. 74.19 per litre in Kolkata.