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

For HSO4- (bisulfate anion)

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
Moller Plesset perturbation MP2=FULL -0.001404 -0.013121 -0.021092 -0.008100 -0.025054 -0.025213 -0.026995 -0.195741 -0.195863 -0.057450 -0.098520 -0.017342 -0.090806 -0.022178
MP4=FULL   -0.012116     -0.023895       -0.196992     -0.016068 -0.090638 -0.020807
B2PLYP=FULL -0.000426 -0.003909 -0.006314 -0.002406   -0.007470 -0.007999 -0.055912 -0.055948 -0.016882 -0.028179 -0.005134 -0.026483 -0.006577
Coupled Cluster CCSD=FULL         -0.023516           -0.099263 -0.015813 -0.089400 -0.020575
CCSD(T)=FULL         -0.023913           -0.100136 -0.016104 -0.090601 -0.020878
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