America's emergency oil stockpile has been drained to its lowest level since 1983, and cheap gas prices right now may be hiding how thin the cushion has gotten — bad news for anyone counting on energy security if another shock hits.

• The Strategic Petroleum Reserve is down to a level not seen since 1983, when it was still being filled for the first time.
• After the latest drawdown, only about 80 million barrels sit above the legal minimum — weeks of cushion at the current pace.
• The military gets first claim on that oil, so the usable amount is even smaller than the raw number suggests.
• Cheap gas is misleading: crude is cheaper than before the Iran conflict, but gasoline and diesel inventories are near record lows, meaning the physical market is tight.
• Half the released barrels went overseas to Europe, and this time the oil was loaned out — it has to be paid back later with a 20% premium, adding future demand.

Outlook: If demand stays high and the reserve keeps draining, the U.S. could hit bottom within weeks, leaving little protection if the Middle East flares up again.