New Delhi: Consumers will have to fork out up to 40 paise a litre more for motor fuels in 13 cities that will upgrade to Euro-IV quality. Petroleum secretary S Sundareshan on Monday confirmed that the government was considering a differential pricing for Euro-IV petrol and diesel but declined to say by how much the prices would be higher from Euro-III fuels being sold now. Sources said an increase of 10-20 paisa would allow state-run oil firms to recover the investments made in creating facilities for making Euro-IV fuels. Another 14-18 paisa a litre increase would come from a revision in dealer margin, due from April as per the formula laid down by the oil ministry. Euro-IV fuels will be introduced in Delhi from March 24. Thirteen major cities, including the four metros as well as Bangalore, Hyderabad and Ahmedabad are to graduate to Euro-IV from April 1. The remaining cities will move to Euro-III, except some areas in east and south that will get the fuels in phases. Sundareshan said,