Experimental measurements of dew points for five synthetic natural gas (SNG) mixtures between 1.9 x 10(5) and 106.0 x 10(5) Pa in the temperature range from 195.5 to 277.3 K and nine SNG + water + methanol mixtures between 1.4 x 10(5) and 73.1 x 10(5) Pa and at temperatures from 237.3 to 288.2 K were determined. The experimental results obtained on the multicomponent systems were analyzed in terms of an equation of state chemical reticular method, which reproduced experimental dew-point temperature data within an absolute average deviation between 0.8 and 3.7 K for the dry systems and from 0.5 to 1.9 K for the systems with water and methanol.