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In page Oxy–fuel welding and cutting:

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Tests[citation needed] showed that an oxy-gasoline torch can cut steel plate up to 0.5 in (13 mm) thick at the same rate as oxy–acetylene. In plate thicknesses greater than 0.5 in (13 mm) the cutting rate was better than that of oxy–acetylene; at 4.5 in (110 mm) it was three times faster.[1] Additionally the liquid fuel vapour is about 4x the density of a gaseous fuel. A high velocity cutting flame is produced by the huge volume expansion while the liquid transitions to a vapour so the cutting flame can cut across voids (air space between plates).