Densities of three binary systems, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) + ethanol, [BMIM][BF4] + benzene, and [BMIM][BF4] + acetonitrile, over the miscible composition range at T = (313.2 to 473.2) K were measured by means of a densimeter at elevated pressure up to 2.00 MPa. The total uncertainty of density was +/- 0.0009 g.cm(-3). The experimental densities were correlated by an empirical equation. The total average relative deviation (ARD) was 0.08 %, and then the excess molar volumes, V-E, were calculated using the experimental densities. The uncertainty of the excess molar volumes was estimated to be about +/- 0.008 cm(3).mol(-1).