Measurements of the densities, viscosities, and speeds of sound of binary mixtures of n-tridecane and n-alkylcyclohexanes (methyl-, ethyl-, butyl-, pentyl-, heptyl-, octyl-, decyl-, and dodecylcyclohexanes) are reported at various mole fractions. Mixture densities, viscosities, and speeds of sound increased with a decrease in temperature and an increase in the component with the higher property value. Excess molar volumes (VmE’s) decreased with increasing alkyl chain length on the n-alkylcyclohexanes. The excess speeds of sound (cE’s) decreased as the n-alkyl chain length decreased until a minimum was reached for ethylcyclohexane, and then it increased for methylcyclohexane. For all molecules tested except methylcyclohexane, VmE’s and excess isentropic compressibilities (KsE’s) had the same sign, suggesting that the amount of space taken up by the molecules was influencing compressibility. Methylcyclohexane, however, had the largest positive VmE, but its excess compressibility was negative and close to zero. Its extra space was not more compressible. The VmE’s, cE’s, and viscosity deviations for n-tridecane mixtures fell between those reported for n-dodecane and n-hexadecane. These data and trends can be used by fuel researchers who are formulating mixtures to represent various fuels.