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

For SiCl3CH3 (methyltrichlorosilane)

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
Moller Plesset perturbation MP2=FULL -0.004617 -0.021394 -0.051215 -0.014200 -0.047045 -0.047627 -0.050621 -0.290105 -0.290542 -0.094394 -0.132576 -0.029046 -0.178800 -0.036388 -0.193359
MP4=FULL   -0.020028     -0.044815       -0.291528     -0.026720 -0.177380    
Coupled Cluster CCSD=FULL         -0.043665           -0.129946 -0.025778 -0.173389    
CCSD(T)=FULL         -0.044698           -0.132095 -0.026612 -0.176782 -0.033854  
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