Joke: NDRC said that China's refined oil is the cheapest in the world without consumption tax.

Sort of. China is a big oil-producing country, and its oil products are basically self-sufficient. There are no tariff barriers and the prices should be cheap. Although there are various complicated turnover taxes from oil production to retail, the state encourages the development of the automobile industry, and gives financial subsidies and various reductions and exemptions. It is really cheap to spread them evenly.