NOVELTY - Manufacturing jet and diesel fuels, comprises: providing pure and/or mixed sesquiterpenes isolated from plant extracts and/or biosynthesized from biomass; purifying the pure and/or mixed sesquiterpenes to produce single components or mixtures of sesquiterpenes; converting the single component or mixed sesquiterpenes to produce isomers and hydrogenating the isomers with at least one hydrogenation catalyst under hydrogen pressure; and distilling either the hydrogenated single component or mixed sesquiterpenes or the hydrogenated isomers to produce high density fuels.    USE - The method is useful for manufacturing jet and diesel fuels (claimed), which are useful in navy platforms including jet aircraft, ships, missiles, and unmanned aerial vehicles.    ADVANTAGE - The method allows for the synthesis of high performance renewable fuels with improved viscosity, net heat of combustion, and high density and cetane number.    DETAILED DESCRIPTION - Manufacturing jet and diesel fuels, comprises: providing pure and/or mixed sesquiterpenes isolated from plant extracts and/or biosynthesized from biomass; purifying the pure and/or mixed sesquiterpenes to produce single components or mixtures of sesquiterpenes; converting the single component or mixed sesquiterpenes by either directly hydrogenating the single component or mixed sesquiterpenes with at least one hydrogenation catalyst under hydrogen pressure, or isomerizing either with or without a solvent, the single component or mixed sesquiterpenes with at least one heterogeneous acid catalyst to produce isomers and hydrogenating the isomers with at least one hydrogenation catalyst under hydrogen pressure; and distilling either the hydrogenated single component or mixed sesquiterpenes or the hydrogenated isomers to produce high density fuels. An INDEPENDENT CLAIM is included for a first and second set of fuels produced from the above methods.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a method for producing the high density biofuels from sesquiterpenes.