Upon CP correction (Fig. ), all Karlsruhe basis sets afford very similar potential energy curves. There is no longer any meaningful distinction between def2-SVP and def2-SVPD results, both of which overestimate ∆E int by about 2.0 kcal/mol relative to triple-and quadrupleζ results that are indistinguishable from one another. Moreover, the shape of the CP-DFT/double-ζ potentials are the same as the converged results, with the same minimum-energy separation of R = 3.75 Å. In the absence of CP correction, we conclude that double-ζ basis sets cannot be assumed to afford correct geometries. A new CCSD(T)/CBS interaction energy has recently been reported for coronene dimer, and in Table we use that benchmark to assess errors in ωB97M-V interaction energies using Karlsruhe basis sets. Although this functional affords sub-kcal/mol errors for the S66 dimers, that level of accuracy is not realized here, where the errors remain 2-3 kcal/mol upon CP correction. However, in the absence of CP correction the relative errors (as a percentage of the total interaction energy) are actually larger for the S66 data set, where they range from 3% (def2-QZVPD) to 38% (def2-SVP). For CP-corrected calculations, errors in the S66 data set range from 3% (def2-QZVPD) to 9% (def2-SVP). These data, combined with the (coronene) 2 results, suggest an intrinsic accuracy of ≈ 10% for ωB97M-V, but that intrinsic limit cannot be reached in double-ζ basis sets unless CP correction is used.