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

For CF3CF2Cl (pentafluorochloroethane)

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 -0.001006 -0.017159 -0.024681 -0.010925 -0.032694 -0.032693 -0.035802 -0.181446 -0.181446 -0.067825 -0.021696 -0.129211
MP3=FULL         -0.030649   -0.076743          
Coupled Cluster CCSD(T)=FULL         -0.030917           -0.019761 -0.101118
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