The aggregate of all 14 facilities is indicative of what an operator would report, had this been one operator's asset base. In aggregate, the discrepancy between the two methods increased from the baseline 958 [368 to 1,455] kg/h over 15 facilities, or 64 [25 to 97] kg/h Given the magnitude of disagreement comparing pairs of single estimates, means of multiple estimates at a facility, and aggregate mean estimates across multiple facilities, one or both methods cannot be providing accurate estimates of emissions at these midstream facilities. While this study focused on two methods, few similar comparisons have been completed