NOVELTY - Synthesizing (M1) fuels involves isolating 1-octene-3-ol from waste biomass or renewable source; dehydrating 1-octene-3-ol with acid catalyst to produce mixture of isomers of 1,3-octadiene and internal octadienes; cyclodimerizing under 1-200 atmosphere and heating at -20 degrees C to 350 degrees C with homogeneous/heterogenous Lewis acid catalyst to effect Diels-Alder cycloaddition to form mixture of unsaturated cyclic olefins, which is catalytically hydrogenating to produce mixture of saturated cyclic hydrocarbons; and distillating to produce fuel mixtures with densities of greater than 0.8 g/ml.    USE - For synthesizing fuels (claimed) useful as turbine and diesel fuels in vehicle and weapon platforms.    ADVANTAGE - The method provides fuel mixture having higher density than either straight chain or branched hydrocarbons and a high enough cetane number to be used in a diesel engine. The fuel mixture has potential to improve the tactical performance of aircraft, weapon systems, UAV's, and diesel powered vehicles, while greatly reducing the net greenhouse gas emissions and environmental impact of these platforms. These fuels can be derived from sustainable sources helping to stabilize fuel prices and reduce the reliance of the Navy on petroleum derived products.    DETAILED DESCRIPTION - Synthesizing (M1) fuels involves isolating 1-octene-3-ol from waste biomass or a renewable source by hydrodistillation of plant material, enzymatic cleavage of fatty acids, or direct biosynthesis with fungi or bacteria; dehydrating 1-octene-3-ol with at least one acid catalyst to produce a mixture of isomers of 1,3-octadiene and internal octadienes; cyclodimerizing the mixture of isomers of 1,3-actadiene and internal octadienes (optionally with other renewable or petroleum derived conjugated dienes having 4-20 carbon atoms, or any dienophile) under modest pressure of 1-200 atmosphere and heating at -20 degrees C to 350 degrees C with at least one homogeneous or heterogenous Lewis acid catalyst to effect Diels-Alder cycloaddition to produce a mixture of unsaturated cyclic olefins; catalytically hydrogenating the unsaturated cyclo-olefins with hydrogen to produce a mixture of saturated cyclic hydrocarbons; and purifying the saturated cyclic hydrocarbons by distillation to produce fuel mixtures with densities greater than 0.8 g/ml. An INDEPENDENT CLAIM is included for fuel mixtures produced by the method (M1).