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

For CCl3CHO (trichloroacetaldehyde)

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) cc-pVDZ cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.001124 -0.018522 -0.041171 -0.012175 -0.043202 -0.043366 -0.045669 -0.203948 -0.204119 -0.087687 -0.025565 -0.144689
MP3=FULL         -0.040071   -0.058710          
Coupled Cluster CCSD(T)=FULL         -0.040575           -0.022999 -0.117371
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ