Come May 1, petrol and diesel prices will change every day in sync with international rates, much like what happens in most advanced markets. State-owned fuel retailers Indian Oil Corp (IOC), Bharat Petroleum Corp (BPCL) and Hindustan Petroleum Corp (HPCL), which own over 95 per cent of nearly 58,000 petrol pumps in the country, will launch a pilot for daily price revision in five select cities from May 1 and gradually extend it to all over the country. "Ultimately, we will be driving towards market linked rates on a daily basis at all pumps across the country," IOC Chairman B Ashok said. A pilot for daily revision of petrol and diesel price will be first implemented in Puducherry, Vizag in Andhra Pradesh, Udaipur in Rajasthan, Jamshedpur in Jharkhand and Chandigarh, he said. State fuel retailers currently revise rates on 1st and 16th of every month based on average international price of the fuel in the preceding fortnight and currency exchange rate.