Oil Marketing Companies (OMCs) kept the prices of petrol unchanged on Sunday across four metros of the country. However, prices of diesel are raised today by 6 paise per litre. According to daily price notification issued by state-owned oil firms, petrol is retailing at a price of Rs. 77.23 per litre in Delhi, Rs. 84.67 per litre in Mumbai, Rs. 80.18 per litre in Kolkata and Rs. 80.23 per litre in Chennai. Fuel prices in Delhi are the cheapest in all metros and most state capitals due to lower sales tax or VAT (Value Added Tax).