Recent studies of several multi-body D 0 meson decays have revealed that the final states are dominantly CP -even. However, the small value of the width difference between the two physical eigenstates of the D 0 -D 0 system indicates that the total widths of decays to CP -even and CP -odd final states should be the same to within about a percent. The known contributions to the width difference from hadronic D 0 decays are discussed, and it is shown that an apparent excess of quasi-CPeven modes is balanced, within current uncertainty, by interference effects in quasiflavour-specific decays. Decay modes which may significantly affect the picture with improved measurements are considered.ii