What does Kenneth say he is looking for and why does this confuse the storekeep?

The storekeep asks him if he needs some help and he lies and says he is looking for a tire pump. The storekeep shows him where they are and Kenneth lies again, saying that he needs different kind. He asks the storekeep the distance to Atlanta and says that he better get going. The announcement confuses the storekeep who was under the impression he had a flat tire.