One study showed that the difference between DLPNO-CCSD(T) and canonical CCSD(T) is consistently less than 0.8 kcal/mol (~0.4 with a TightPNO cutoff) when using the aug-cc-pVnZ basis sets (n = D, T, and Q), with a standard deviation of 0.18 kcal/mol at aug-cc-pVTZ basis set, particularly for barrier heights and reaction energetics .