Why is the gasoline in Zhihu private gas station cheap?

One is that because of different channels, the oil of many private gas stations is refined by local refineries, but because of the low operating cost, there is no standard storefront, personnel, welfare and other configuration for three barrels of oil, and the operating cost alone is much lower. Third, for example, three barrels of oil not only sell oil, but also have many businesses such as mining, research and development, oil refining and oil transportation.