As a low-cost alternative that can yet provide well-defined dispersion energies, our group has developed a specialized form of the MBD Hamiltonian that is suitable for use with SAPT. Because SAPT dispersion is defined at all length scales, this entails modifications to extend MBD to shorter length scales where the conventional MBD energy would be damped away; this is accomplished by incorporating dipole-quadrupole dispersion via screened C 8 coefficients. The dispersion is still damped as R → 0 but on a much shorter length scale as compared to the conventional version of MBD that is designed for use with DFT. The resulting SAPT+MBD approach affords excellent agreement with dispersion energies obtained from SAPT2+(3), despite a completely different formalism, thus we deem it appropriate to use this version of MBD to provide dispersion benchmarks. These are easily obtainable for large systems as all that is required is diagonalization of a (3N atoms ) × (3N atoms ) harmonic oscillator Hamiltonian matrix, as described in Section 2.1.2.