State-owned fuel retailers — IOC, Bharat Petroleum Corp (BPCL) and Hindustan Petroleum Corp (HPCL) — revise petrol and diesel prices on 1st and 16th of every month based on average imported cost and rupee-dollar exchange rate in the previous fortnight.
product_or_material_produced: Bharat Petroleum, Petroleum; product_or_material_produced: Hindustan Petroleum, Petroleum