From the total D2 desorption during the 6 TPD runs, we estimate that the total carbon deposition on Pt4Ge/alumina amounts to ~1.8 C atoms per deposited Pt4Ge cluster, which is less than a third the total estimated for Pt4/alumina (5.75 C/cluster). It should be noted that due to uncertainties in the intensity calibration process, the absolute desorption numbers given here and in Tables and are uncertain by ~50%, however, the relative uncertainties for comparing TPD data in different experiments are smaller -on the order of ±10%. Thus, the TPD data indicate that Pt4/alumina cokes more than a factor of three faster than Pt4Ge/alumina.