Notable reductions in the post-SCF WTMAD-2 values are still seen from the reoptimized B95c to m = 2 and from m = 2 to m = 3. While some small further reductions occur at longer expansions, we decided to choose m = 3 as a reasonable compromise between performance and simplicity. This provides the final LH24n functional, and self-consistent data for LH24n-D4 are included in Table . The overall WTMAD-2 of 3.10 kcal/mol is the lowest self-consistent value of any rung 4 functional so far (as discussed above, the still somewhat lower B22plus value has been obtained without self-consistency). Of course double hybrids can achieve still lower values (Table ), as GMTKN55 appears to be particularly well-suited for applying perturbational ), showing that the B97c-type series expansion offers notable improvements over B95c in the presence of both n-and t-LMFs. The improvements for LH24t-D4 arise from the NCI and iso & large subcategories but also from barriers, while basic & small is essentially unaffected.