TOKYO (AFX-ASIA) – Major Japanese refiner Showa Shell Sekiyu KK will keep gasoline production at the current level from April onward, when it will stop supplying gas to Idemitsu Kosan Co, another refiner and oil products distributor, the Nihon Keizai Shimbun reported. Showa Shell boosted output 6% at the end of 2003 as a temporary…