TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The fuel contains less than 5 wt.% aromatics, at most 5C tail gas, 5-20C boiling liquids, or more hydrogen than 4C, preferably 6C, hydrocarbon species or more hydrogen than gasoline derived from petroleum. The fuel contains alcohols; if any, unsaturates other than aromatics; if any, negligible amounts of sulfur; and preferably only negligible amounts of nitrogen. It may contain 1-4 or 1-5C hydrocarbons. It is composed of at least 4 or 5C, 5-20 or 5-18C, or 5-9 or 10-20C hydrocarbons. The fuel comprises a light Fischer-Tropsch liquid containing at least 77 wt.% normal and iso-paraffins, less than 20 wt.% olefins, less than 9 wt.% alcohols, less than 0.001 wt.% sulfur, and less than 5 wt.% aromatics. The fuel or portions of the fuel have been subjected to hydrogenation and/or hydrocracking treatment. It may be formed as a blend of up to 9 wt.% alcohol(s) and a Fischer-Tropsch product. The alcohol(s) include(s) methanol, ethanol, propanol, and/or butanol. The hydrocarbon content of the fuel has an iso- to normal-paraffin weight ratio of 0.02:1-20:1, 0.1:1-15:1, or 0.5:1-12:1. The fuel contains less than 200, preferably 0 ppm primary alcohol oxygenate, as oxygen, on a water free basis, based on the total weight of the fuel.Preferred Properties: At least 50 wt.% of the material boiling below 700 degrees F, or all of the material boiling above or below 700 degrees F has been subjected to treatment with hydrogen under conditions to saturate at least a portion of any aromatics and/or other unsaturates that may be present. The fuel has a flash point of 80-150, preferably 90-130 degrees F.Preferred Method: The fuel is manufactured by separating from the Fischer-Tropsch product a heavy portion of more than 21C material, hydrocracking the heavy portion to produce a hydrocrackate, and separating 5-20C material from the hydrocrackate. It further includes hydrogenating the light product stream. The fuel is mixed with a petroleum fuel feedstock to provide a product with less than 0.05 wt.% sulfur and less than 10 wt.% aromatics.