New Delhi, May 7 : Petrol and diesel prices in the country rose again sharply by 28 paise and 31 paise per litre respectively, on Friday as Oil Marketing Companies (OMCs) continued to cover for their losses on holding back price rise for past 18 days due to state elections. This is fourth increase in fuel prices in as many days as petrol and diesel prices rose by 15 paise and 18 paise per litre respectively on Tuesday and by 19 paise and 21 paise per litre respectively on Wednesday and by 25 and 30 paise respectively on Thursday after a 18 days break. With Friday's increase, petrol is now being retailed at Rs 91.27 a litre and diesel Rs 81.73 a litre in the national capital. Across the country as well the petrol and diesel price increased on Friday but its quantum varied depending on the level of local levies in respective states. Petrol prices in some states have breached the Rs 100 per litre mark while premium petrol has been hovering above that level for some time now. IANS had reported earlier that OMCs may begin increasing the retail price of petrol and diesel post state elections as they were incurring losses to the tune of Rs 2-3 per litre by holding the price line despite higher global crude and product prices. The oil companies had already increased the ATF prices by 6.7 per cent effective this month. OMCs benchmark retail fuel prices to a 15-day rolling average of global refined products' prices and dollar exchange rate. In the last fortnight global oil prices have hovered in $66-67 a barrel range higher than the levels when petrol and diesel prices were last revised. Crude prices have jumped around $ 69 a barrel now. The price of the two auto fuels had fallen by 16 paise and 14 paise per litre respectively on April 15 after a 15 day break when OMCs kept its prices static. Thereafter, revision of fuel prices have been halted. The OMCs went on price cut for the first time this year on two consecutive days - March 24 and 25 after keeping oil prices steady for past 24 days. It again reduced the price on March 30. Thereafter, fuel prices have remained unchanged for past 15 days before falling again on April 15. In all petrol prices have fallen by 77 paise per litre while diesel by 74 paise per litre in 2021 so far. Earlier, petrol and diesel prices increased 26 times in 2021 with the two auto fuels increasing by Rs 7.46 and Rs 7.60 per litre respectively so far this year. With global crude prices at around $69 a barrel mark, OMCs may have revise fuel prices upwards again if there is any further firming up. /IANS