ISLAMABAD : The Federal Board of Revenue (FBR) has increased general sales tax ratio on Compressed Natural Gas (CNG). According to official of Sui Southern and Sui Northern Gas, general sales tax ratio on Compressed Natural Gas has been increased from 26 per cent to 31 per cent. The gas companies have included the increased tax in the gas bills. It is pertinent to mention here that the Supreme Court of Pakistan had expressed reservations even on 26 per cent General Sale Tax.