While inventories are evolving to incorporate empirical data it is important that the data being used is defensible. Results from this study conrm our previous nding that the TD estimates disagree. With an increase of sample size by repeated measurements, compared to the baseline, the disagreement between the methods expanded. Across all 15 facilities in the baseline deployment, the methods exhibited a relative dierence of 28% [10% to 43%] in the mean, which increased to 49% [32% to 68%] over 14 facilities during the EOP, despite a dramatic increase in estimates by both methods (from 43 total estimates in the baseline to 773 estimates). This becomes particularly signicant when considering methane or other GHG fees, as the choice of TD measurement method can lead to substantial variations in the fees assessed.