NEW DELHI:With global crude prices inching upwards, the oil marketing companies increased retail prices of petrol by Rs 0.64/litre at Delhi. However, price of diesel decreased by Rs 1.35/litre at Delhi. “Since last price change, there has been an increase in international prices of petrol while international prices of diesel have shown a downward trend. INR-USD exchange rate has depreciated during this period. Combined impact of these factors warrant an upward revision in prices of Petrol and a downward revision in prices of Diesel, the impact of which is being passed on to the consumers with this price change,” IOC said.