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

For HClO4 (perchloric acid)

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 aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ
Moller Plesset perturbation MP2=FULL -0.000541 -0.012011 -0.019963 -0.007328 -0.023755 -0.023901 -0.025620 -0.125845 -0.125968 -0.055511 -0.097606 -0.016383 -0.089088 -0.020451 -0.099701 -0.158479 -0.223115 -0.387624
MP3=FULL         -0.022238   -0.043250                      
Coupled Cluster CCSD(T)=FULL         -0.022199           -0.098766 -0.014888 -0.088149     -0.158004   -0.388800
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 aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ