Unfortunately, delivery problems could last more than a few days, so people are going to have to plan when they buy fuel. In my last job, I used to fill up every three or four days. I had a long commute and a small car, which didn't hold much petrol. If I were still doing that job, I'd be on the internet trying to find out where I could guarantee to get petrol and I'd head straight there rather than faffing around trying the nearest petrol stations first. I expect other people would do the same, so certain petrol stations would get busy very quickly.
People can't buy more petrol than they need, unless they have a personal storage depot, but some people do need to buy a lot and they need to buy it regularly. They can't afford to run out on the way to work, so it's sensible to be opportunistic and fill up when fuel is available.
National treasures. Who would you choose?



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and if it happens of an evening, people have to sit in pitch black for hours. Why would anyone actively want this?