

But such a system is not yet in place right? They would have to set up something ad-hoc to keep track of licence plates and how much they fueled up at each petrol station around the country, which seems like something you cannot realistically pull off on the short term.













If it is per gas station they could hypothetically require gas stations to individually keep track of licence plates and how much they fueled up in their own bookkeeping. See the same licence plate twice in a day? They don’t get to fuel up.
That way they could also enforce the rules by randomly checking ledgers
Edit: As for the fuel tourism, I’m not sure if banning the transport of fuel is enforceable. The EU has free movement of goods and people, so it is perfectly allowed to buy your petrol across the border.
As a historical parallel, back in 1973 the Dutch government rationed the sale of petrol by distributing fuel stamps. The consequence was that in the border regions people just went to fuel up in Germany where the petrol was not rationed.