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

For C6H12 ((Z)-hex-2-ene)

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 -0.002796 -0.009978 -0.009978 -0.008077 -0.028719 -0.030843 -0.031276 -0.111594 -0.113262 -0.050494 -0.102333 -0.015718 -0.095695 -0.018081
MP3=FULL         -0.028433   -0.040779              
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