for 16,456 species in enum-halocarb4, as shown in Figure . Overall, the mean absolute deviation (MAD) of RMG's GAV estimates for ∆ f H • 298K is reduced from 66 kcal/mol to 2.21 kcal/mol with the new groups, which is now on-par with RMG's CHO GAVs which typically estimate enthalpy within 2-3 kcal/mol. The new groups also significantly improve accuracy at estimating S • 298K (MAD reduced from 92 to 1.48 cal/mol/K) and Cp • 1000K (MAD reduced from 13 to 0.51 cal/mol/K). Based on the halogen GAV performance on the large and diverse enum-halocarb4 dataset, RMG's new halogen GAVs appear to be reliable at accurately predicting thermochemical properties for a wide range of halocarbons.