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

For CH2ClCH2OH (2-Chloroethanol)

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 -0.001055 -0.009529 -0.017006 -0.006447 -0.022166 -0.023037 -0.023998 -0.105018 -0.105772 -0.044812 -0.078576 -0.013575 -0.079125 -0.016134 -0.089925
MP3=FULL         -0.020942   -0.022754       -0.079493 -0.012276 -0.078170    
MP4=FULL   -0.008943     -0.021201       -0.107686     -0.012445 -0.079224 -0.014983 -0.081490
B2PLYP=FULL -0.000318 -0.002861 -0.005094 -0.001932 -0.006583 -0.006832 -0.007117 -0.030072 -0.030294 -0.013138 -0.022634 -0.004056 -0.023140 -0.004817 -0.026198
Quadratic configuration interaction QCISD(T)=FULL                       -0.012378 -0.079020 -0.014888 -0.079280
Coupled Cluster CCSD=FULL         -0.020767         -0.052317 -0.079385 -0.012092 -0.077885 -0.014542 -0.089260
CCSD(T)=FULL         -0.020366           -0.104687 -0.012373 -0.079003 -0.014878 -0.081918
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