#4 I saw it for the third time and don't get it. Is he doing something stupid or illegal?

#4. No, neither. He is merely creating a vortex in the pipe, this will induce the gasoline to exit the pipe faster which saves time, a commodity we all have too little of, and it can also have a vacuum effect which can cause far more petrol to enter the tank that that which one is paying for.
Also, he is driving a Tesla.