One fun fact I’ve heard is that the strategic oil reserve requires like 100-150 million barrels of oil to maintain operational pressure and even be functional. This means we can’t draw it down to zero; not even close.
https://www.cnbc.com/2026/08/15/strategic-petroleum-reserve-... "Depleted strategic oil reserve nears level that raises concerns about damage to caverns, operations"
https://fortune.com/2026/08/17/depleted-us-strategic-oil-res... “U.S. strategic reserves are getting so low the drawdown threatens to damage the 60 underground salt caverns storing American oil”
From what I found out, turns out the question of SPR design and operational limits is a complex issue to say the least. The SPR is a big system composed of many sub-systems and there are entangled legal, policy, technical issues at play. Interesting stuff!