Petrol has become cheaper by One Rupee Forty Two Paise, a litre and Diesel Two Rupees One Paise. The new prices will come into force from midnight tonight.<br/>With this change, Petrol will cost 61 rupees and 9 paise in Delhi and Diesel 52 rupees 27 paise per litre. <br/><br/>Indian Oil Corporation in a statement said the reduction in prices of petrol and diesel has been effected following decline in prices of pertrol and diesel in international market and changes in Rupee-Dollar exchange rates.