The Japanese government is planning on imposing tough new fuel efficiency regulations on carmakers that sell vehicles domestically. The trade and transport ministries are expected to draft proposals that would see economy increase 20% from 2004 levels by 2015. At the moment, all automakers must improve economy by 23% between 1995-2010. The proposals will for both petrol and diesel cars will be released by the end of the month. These new standards would make the Japanese regulations the world’s toughest. Japan remains the number two car producer in the world, so these regulations have the potential to affect more than just domestic models.