Three-phase (ice + hydrate + vapor and liquid water + hydrate + vapor) equilibrium data are presented for xenon structure I (sI) hydrate in the temperature range 228-288 K. Four-phase (ice + hydrate + liquid hydrocarbon + vapor and liquid water + hydrate + liquid hydrocarbon + vapor) equilibrium data are reported for structure H (sH) hydrates of xenon + 2,2-dimethylbutane and methane + 2,2-dimethylbutane. The data for both of the latter systems indicated two invariant five-phase points (I + liquid water + sH + V + liquid hydrocarbon) at 273.15 K while the data for the water + xenon + 2,2-dimethylbutane system indicated an additional quintuple point (liquid water + sI + sH + vapor + liquid hydrocarbon) at 283.2 K.