For non-quantum fluids, the Miller function, h(T) = T ln(p/p(c))/(T - T-c), with T-c and p(c) the temperature and pressure at the critical point, presents a minimum in the liquid-vapor coexistence curve. By analyzing values from a NIST program for 105 fluids, we find that the temperature, T-M, of this minimum is closely correlated with the normal boiling temperature, T-b, and with the critical temperature of the fluid. We also demonstrate that the value of the minimum, h(M) = h(T-M), is well correlated with the acentric factor. We show that the Miller function can be used as a powerful tool for checking vapor pressure values obtained from equations of state or from vapor pressure equations, especially near the critical point. (C) 2012 Elsevier Ltd. All rights reserved.