In the production process of ethylene propylene hydrocarbon 2-metil-spiro[2,6]nonan based on produced  byproducts from pyrolysis of cyclopentadiene has been synthesized. Based on T-6 fuel and the newly synthesized hydrocarbon new compositions have been obtained and the physicochemical properties have been studied by the modern methods. These compositions are suggested to be used as high-density, high energetic synthetic hydrocarbon fuels in modern aviation.