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

For CH2CHOCHCH2 (Vinyl ether)

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 -0.001810 -0.008455 -0.008455 -0.006405 -0.022007 -0.023055 -0.023689 -0.092998 -0.093833 -0.037287 -0.085089 -0.012277 -0.075218 -0.014265
MP3=FULL         -0.021615   -0.037733              
MP4=FULL   0.000628                   -0.011532 -0.007798 -0.013509
Coupled Cluster CCSD=FULL         -0.021384           -0.088657 -0.011292 -0.076846 -0.013236
CCSD(T)=FULL         -0.021650                 -0.013429
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