Petrol and diesel rates were increased by state-run oil marketing companies on Tuesday, which marked an eight straight day of hike in the fuel rates. With effect from 6 am on Tuesday, the price of petrol was at Rs. 74.13 per litre in Delhi, Rs. 76.82 per litre in Kolkata, Rs. 79.79 per litre in Mumbai and Rs. 77.06 per litre in Chennai, according to Indian Oil Corporation's (IOC) website, iocl.com. Petrol prices were hiked in the range of 22-23 paise per litre in the four metros compared to the previous day's rates, data from Indian Oil showed.