State-owned oil companies – IOC, BPCL and HPCL – decided to have a uniform petrol price despite government giving them freedom to price the fuel. They will revise prices once a month based on input cost. The three retailers will once in a month coordinate on pricing of petrol based on international price trend of crude oil and gasoline. Indian Oil Corporation Director (Finance) S V Narasimhan said this in New Delhi yesterday. On June 25, an Empowered Group of Ministers headed by Finance Minister Pranab Mukherjee had decided to free diesel prices from government control.