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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For C8H16 (cyclooctane)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.003827 -0.013505 -0.013505 -0.011049 -0.038900 -0.041696 -0.042316 -0.149589 -0.151857 -0.075767 -0.137339 -0.021175 -0.129207
MP3=FULL         -0.038476   -0.050812            
B2PLYP=FULL -0.001160 -0.004042 -0.004042 -0.003300 -0.011488 -0.012288 -0.012472 -0.042826 -0.043503 -0.021906 -0.039384 -0.006306 -0.037426
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ