I am trying to find GIS data for various types of petroleum and natural gas infrastructure (pipelines, refineries, gathering lines, pump stations, etc). I've found quite a few sources, mostly for-profit companies selling the data. However, without spending thousands of dollars on the data, it's hard to know what I'd be getting from any of these vendors. Most of them state the resolution of the data but I'm more concerned with the completeness of it. I've also found several government sources, which seem to offer more reliable data but the different layers I'm interested in are scattered across several agencies or just not available. So,
I'm interested in data in the US in this case.
The sources I've found so far include: