Indian refiners are considering using their oil inventories to cut import costs as global oil prices have risen to about $80 a barrel and the Indian rupee has plunged, said the chairman of the nation’s top oil refiner, Indian Oil Corp. Sanjiv Singh, who was present at a Sept. 15 meeting of Indian oil refiners where the inventory plan was discussed, said the companies are also looking at ways to widen their crude slate and crude sources to cut imports.