Excess molar volumes, V-m(E), have been measured using a dilatometric technique for binary mixtures of heptan-1-ol (n-C7H15OH) + pentane (n-C5H12), + hexane (n-C6H14), + heptane (n-C7H16), + octane (n-C8H18), and + 2,2,4-trimethylpentane (2,2,4-TMP) at T = 293.15 K. V-m(E) has been found to be negative throughout the entire range of composition for (x)n-C7H15OH + (1 - x)n-C5H12, + (1 - x)n-C6H14, and + (1 -x)2,2,4-TMP. V-m(E) has been found to be positive at lower mole fractions of n-C7H15OH and negative at higher mole fractions of n-C7H15OH for (x)n-C7H15OH + (1 - x)n-C7H16 and (x)n-C7H15OH + (1 - x)n-C8H18 with an inversion of sign from positive to negative values of V-m(E) occurring at x similar to 0.18 and x similar to 0.43, respectively, for these mixtures. V-m(E) has been fitted in a smoothing equation.