In this work the GCA-EoS model is applied to represent the phase behavior of systems containing cyclic hydrocarbons, alcohols and water. The presence of naphthenic hydrocarbons in normal fossil fuels makes this information important for the prediction of properties of bioethanol/gasoline blends. Since GCA-EoS is a group contribution equation of state, also cyclo-alcohols were included in the study to increase the experimental databank for tuning the model parameters. The GCA-EoS was able to correlate and predict the phase behavior of multicomponent mixtures typical of bioethanol/gasoline blends. (C) 2013 Elsevier B.V. All rights reserved.