Comparison to bottom-up inventories reveals that similar oil and gas sites do not necessarily have similar emission characteristics. Sites 2, 3, 4, and 6 are all production sites with five to eight equipment groups and bottom-up inventories ranging from 0.75 to 0.93 t/30 days. Despite these similarities, the average across CMS-based inventories is 7.69x and 5.28x larger than the bottom-up inventories for sites 4 and 6 but only 1.35x and 1.32x larger for sites 2 and 3. This suggests that bottom-up inventories are not always able to capture emission variability between sites, a finding in line with existing literature (e.g., Wang et al. ). CMS-based inventories are all slightly smaller than the bottom-up inventories for the two compressor stations (sites 1 and 5), but the limited sample of compressor stations makes it challenging to generalize this conclusion.