PETROLEUM- AND FISCHER-TROPSCH- DERIVED KEROSENE BLEND

摘要

A fuel composition comprising a petroleum derived kerosene fuel and a Fischer-Tropsch derived kerosene fuel, wherein said Fischer-Tropsch derived kerosene fuel contains normal and iso-paraffins in a weight ratio of greater than 1:1 and/or wherein the freeze point of the composition is lower than the freeze points of both of said petroleum derived kerosene fuel and said Fischer-Tropsch derived kerosene fuel; and a method of operating a jet engine or a diesel engine and/or an aircraft which is powered by one of more of said engines, which method involves introducing into said engine such a fuel composition.