To examine this in detail, we performed more extensive benchmarks using Pople-style basis sets. Calculations in Ref. 1 employ a small ("diet") subset of the GMTKN55 database, excluding reactions containing elements that are not supported by Pople basis sets. We exclude the same reactions, in order to have equivalent tests for all basis sets, but we otherwise use the full set of GMTKN55 thermochemical and kinetics data, amounting to 899 data points for each functional and basis set, versus 139 data points in Ref. 1. We consider the same exchange-correlation functionals as in Ref. 1, namely, B3LYP, M06-2X, 32 and ωB97M-V, except that we augment B3LYP with the D3 dispersion correction. Dispersion effects on thermochemical stabilities can be significant, and they are also important for obtaining accurate conformational energies. For the calculations reported here, the D3 correction reduces errors by 2-4 kcal/mol relative to uncorrected B3LYP values.