Bunker fuel exemption for IFO 180/380 CST enables nil central excise for qualifying Indian-flag container voyages under conditions. Provides nil Central Excise duty for IFO 180 CST and IFO 380 CST used in Indian-flag ships carrying containerised export-import cargo or empty containers between Indian ports, subject to eligibility conditions: Indian registration and flag, carriage between Indian ports (including via an intermediate foreign port), restriction on cargo documentation to IGM/EGM only, submission of a declaration with a consumption-rate certificate from a recognized classification society and voyage distance, and an undertaking to pay duty with interest if conditions are not met. The exemption is excluded on or after 11 May 2015.