  We examine the application of the recently developed dual basis methods of
Head-Gordon and co-workers to double hybrid density functional computations.
Using the B2-PLYP, B2GP-PLYP, DSD-BLYP and DSD-PBEP86 density functionals, we
assess the performance of dual basis methods for the calculation of
conformational energy changes in C$_4$-C$_7$ alkanes and for the S22 set of
noncovalent interaction energies. The dual basis methods, combined with
resolution-of-the-identity second-order M{\o}ller-Plesset theory, are shown to
give results in excellent agreement with conventional methods at a much reduced
computational cost.
