What excuse did Myrtle always use so that she can meet tom in New York in The Great Gatsby?

In the Great Gatsby, Myrtle gives different excuses to leave, to see Tom. On the day Nick is out with Tom, they meet Myrtle in New York, and she tells them, that she had told George, that she was going to visit her sister. Tom always uses his car, to visit Myrtle, by telling George, that he would one day sell his car to him.