Memorandum by the Secretaries for Mines and Petroleum. INTRODUCTORY. This question was last considered generally by the Committee 21st February, 1941, (L.P. (41) 6th meeting, Conclusion 4). The Committee had before them a document, (L.P. (41) 4), which embodied the reports of a number of technical committees set up by the Department at the outbreak of war to examine the possibilities of replacing imported petroleum oil by home produced oils and substitute fuels. The Committee then decided no action, other than the development of the use of coal tar oils to replace fuel oil and further consideration of the question of gas producers for road vehicles.