[hwillis]

That's just not true, unless you mean resource reserves. Taiwan has the largest NG strategic reserve I know of (11 days) and the US has the largest petroleum reserve in the world at 19 days: https://en.wikipedia.org/wiki/Strategic_Petroleum_Reserve_(U...

Resource reserves are unextracted and not replenished. They are not the same as storage.

[rich_sasha]

I don't think this is right. Here's the first link I can find: https://www.intellinews.com/how-many-days-of-gas-consumption...

This quotes Poland as having 89 days' worth of gas consumption with storage full, Hungary at 133 and Germany at 108. These are actual storage reserves, not untapped resources, at least for Poland.