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This automated method is for determining the composition of refinery gas samples or expanded liquefied petroleum gas (LPG) samples obtained from refining processes or natural sources. Non-condensable gases, hydrogen sulfide, C1 through C4 hydrocarbons and C5 paraffins are reported individually, while C5 olefins and C6+ hydrocarbons are reported as a composite. Oxygen is not separated from argon. Results for hydrogen sulfide, if present, may not be quantitative on some analyzers. The method yields quantitative results from 0.1 to 99.9 mol-% for a single component or composite; except for hydrogen sulfide that yields quantitative results between 0.1 and 25 mol-%. Results may also be reported in mass-%.