Ban Xiaobo and Xu Chao did indeed have this in mind.
Although their need for gasoline wasn't significant, when repairing or selling cars to others, they still needed to add some fuel to the vehicles. By now, the gas at the stations had long been depleted by others, so they had no choice but to resort to this method, siphoning whatever amount they could.
The three of them had clear responsibilities, with Ban Xiaobo and Rong Yuan drawing oil into barrels, while Xu Chao was using his Space Element Ability to collect the ready cars one by one into his space.
Xu Chao's pace in collecting the cars into his space was slow, probably because the cars were relatively large. Su Jin and the others noticed that it took a full two minutes with his hand on each car before it disappeared.