Using the procedure by Wong and Sandler (1992), zero pressure mixing rules for cubic equations of state can be made consistent with the quadratic composition dependence of the second virial coefficient. The MHV1 mixing rule extended on the second virial coefficient condition has been applied to 6 binary and 3 ternary systems. No significant differences have been observed from predictions of the original MHV1 model which uses the linear mixing rule for equation of state parameter b.