What is weird about Nick's drive in New York with Gatsby? What is odd?

The oddest thing about the drive to New York was the conversation. Gatsby, who had said little in the time he and Nick had been acquainted never stopped talking. Nick found it disconcerting.

I had talked with him perhaps half a dozen times in the past month and found, to my disappointment, that he had little to say: So my first impression, that he was a person of some undefined consequence, had gradually faded and he had become simply the proprietor of an elaborate road-house next door.

And then came that disconcerting ride. We hadn’t reached West Egg village before Gatsby began leaving his elegant sentences unfinished and slapping himself indecisively on the knee of his caramel-colored suit.