SAIL fares poorly when compared to international efficiency standards and those of private Indian companies such as JSW and Tata Steel in blast furnace productivity, raw material consumption and energy usage, according to the review document.For example, SAIL's average daily blast furnace productivity of 1.58 tonnes per cubic meter last fiscal year ended March was 40 percent lower than that of JSW. SAIL said the metric improved 7 percent between April and December last year.Its use of coke - derived from high-quality coal, and thus costly - was also higher than private peers and global standards. April-December coke use came down 3 percent from a year ago, SAIL said. Its use of pulverized coal injection technology - a cheaper substitute to coke - was the lowest compared to JSW and Tata in 2015/16.