To assess the accuracy of RMG's new halogen thermo groups in estimating thermochemistry Then, an RMG model was built using the Foundational Fuel Chemistry Model Version 1.0 46 in RMG-database as a seed mechanism. enum-halocarb4 was used as an RMG thermo library during 2-BTP model generation, should RMG need thermochemistry for an intermediate in that dataset; other HHCs were estimated using the new GAV scheme. Our description is brief because the goal here is not to produce a better kinetic model, but to generate a test-set of molecules from a realistic scenario of automated model generation with RMG. 104 HHCs from the resulting RMG mechanism that were not in the enum-halocarb4 GAV training set were recalculated at G4 level using the automated thermochemisty workflow previously discussed, and the calculated thermochemical properties were compared to GAV estimates.