The late 19th and early 20th centuries marked the early days of gasoline stations, and records from that era can be sparse. However, based on your list and historical records, here are some gasoline brands that operated in Montana during that period:

1. Grizzly Gasoline
2. Glacier Gasoline
3. Litening Gasoline
4. Spur Gasoline
5. Montana Power
6. Powerized Gasoline
7. Monto Gasoline
8. Silver Gasoline
9. Hi-Line Gasoline
10. Laureleaf Gasoline
11. Wildfire Gasoline
12. Hi-Power Gasoline
13. Mule Gasoline
14. Hart Gasoline
15. Weiloff's Gasoline
16. Montana Chief Gasoline

These brands reflect a mix of local and regional companies that were prevalent in Montana during the early days of the automobile industry. While some of these names might not be well-documented in national records, they were likely significant in local contexts. It's important to note that many small, independent gasoline brands existed during this time, and their histories might be captured in local archives, historical societies, and old business directories.