Newer or central parts of the city are connected to the city's gas pipe infrastructure and the amount of LNG you use is recorded by a meter. In older or out-of-the-way parts of the city people need to have tanks of LPG delivered to their restaurants or homes. I came across what seems to be a hybrid system in the downtown area. There is a gas meter, but it's connected to two LPG tanks. Maybe the gas company makes regular deliveries without being called and notes the number on the meter to calculate the bill.
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