It wasn't. Last he recalled, it wasn't required for a driver to understand the elements of a gasoline. He'll know it when he sees it, and he left it at that.
"I don't," Cloud answered the verbose lady simply. "And I don't know if I'm one of them either. I just got here." If that wasn't obvious enough. "So this place is called New York?" Cloud decided against asking about the secret club of sorts. He'll know it when he needs it.