Diesel and petrol prices will change every day from tomorrow. Oil marketing companies (OMC) ran a 40-day pilot in five cities - Chandigarh, Jamshedpur, Puducherry, Udaipur, and Visakhapatnam - before deciding to roll out the fluctuating price system nationally. Until **w, diesel and petrol prices were revised on a fortnightly basis. State-run companies - Indian Oil Corporation, Hindustan Petroleum Corporation and Bharat Petroleum - operate 54,000 ...