Did you travel in Europe? Even without crisis, gas stations are often way busier on the cheaper country's border than more expensive.

My friends living in Switzerland (near the border) always go to Germany to fuel up. And, even without a crisis, gas stations on the cheaper sides of borders are often way more crowded than on the other side.

Also, keep in mind that Slovenia is roughly the size of Los Angeles. Or not much wider than Long Island. If there fuel was 30% cheaper on one side of Long Island, than on the other, I'm sure plenty of people wouldn't think twice about that.

It would probably be illegal under EU law to discriminate between residents and non residents of Slovenia

Imagine gas being the same as toilet paper... you know exactly how much you use daily on average and you optimize the distribution.

https://www.24ur.com/novice/gospodarstvo/bencin-nafta-dostav...

That means they transport 110-120 tanker trucks of fuel daily, and in "times of crisis", they can do approximately 200 tankers per day.

Now imagine just the people from gorizia going across the border to buy gas in nova gorica (the country border goes literally through the city, gorica = gorizia, nova gorica= new gorizia), and instead of eg. 1 tanker truck that day, they now need 4. Just in one small cizy.

Then there's trieste, a city of about 200k people, and just ~10km away is the city of sežana (13k pop and 6 gas stations).

Then there's villach in austria and gas stations in slovenia ~20km away.

Croatia? Zagreb (capital, almost 800k pop) is ~20km away form slovenia.

And then you get the news that there is no gas at this or that gas station, and all the locals pick up their gas cans, jump into their cars and go fill up their cars + 20, 40 liters of extra gas in cans.

To go back to the toilet paper crisis... we didn't even need foreigners coming, just the media showing the situation abroad was enough to cause a shortage of toilet paper locally.