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Lowering diesel engine emission levels, while preserving performance, is the main demand in the development of current and future diesel engines. To fulfill it, the in-cylinder vaporization and combustion processes of the diesel spray must be well understood. An important parameter in the vaporization process of a diesel spray is the maximal penetration distance of liquid fuel (i.e. the “liquid length”). So-called mixing-limited vaporization models assume that the vaporization rate of the fuel is limited by the mixing rate of fuel and ambient gas. Such models have been shown in the literature to accurately correlate liquid lengths for moderate to high in-cylinder densities, i.e. in the density range relevant to modern diesel engines. Since in-cylinder pressures can reach high absolute levels, real gas effects should be considered in these models.