Most African countries could pay less for oil products, says a new report just  released  by The World Bank and the Energy Sector Management Assistance Program (ESMAP). Petroleum Product Markets in Sub-Saharan Africa: Comparative Efficiency Analysis of 12 Countries  says Madagascar could save about US$500 million if it uses rail to transport oil instead of road.  Use of rail would transport more oil at lower costs. The report reviews the efficiency of the petroleum sector in twelve selected countries of Sub-Saharan Africa and suggests ways in which the product market could be made more efficient.