The solid-liquid equilibrium, SLE, has been measured for {a hydrocarbon (C-18-C-28) + methyl 1,1-dimethyl-ethyl ether (MTBE), or ethyl 1,1-dimethylethyl ether (ETBE)) mixtures from 280 K to the melting temperature of the hydrocarbon. Experimental solubilities are compared with values calculated by means of the Wilson, UNIQUAC and NRTL equations utilizing parameters taken from SLE. The liquid-liquid equilibrium, LLE, of {water + (ETBE), or methyl 1,1-dimethylpropyl ether (MTAE), or ethyl 1,1-dimethylpropyl ether (ETAE)) has been measured from 300 K to 360 K. The mutual solubility in binary systems of (heptane, or 1-heptene, or toluene + MTBE, or ETBE, or MTAE) in the temperature range from 273 K to 298 K has been measured. All these systems have been found to be homogenous. The excess molar volumes,V-m(E), at the temperatures 298.15 K and 308.15 K have been measured for the mixtures of Ca hydrocarbon (hexane, octane, decane, dodecane, tetradecane, hexadecane), or cyclohexane or 1-heptyne + a branched chain ether (ETBE)). The excess molar volumes of all mixtures except for 1-heptyne are positive over the whole composition range. The experimental results have been correlated and compared with the results from Prigogine-Flory-Patterson (PFP) theory.