Experimental measurements of dew points for eight synthetic natural gases (SNG) + water mixtures were carried out between (1.2 and 99.3) x 10(5) Pa in the temperature range from 226.4 to 287.6 K. The experimental results were analyzed in terms of both an equation of state model and an excess function-equation of state method, which reproduced the experimental data within AAD from 1.4 to 4.1 K and from 0.6 to 4.3 K, respectively.