I think that after all Carly has been thru with vehicles and the fact that Michael just woke up and doesn't even have a license, she has a very good reason to not want him to have that car. Heck, I don't want him to have that car, because that will be the next storyline for him and Carly - she'll go into labor, he'll be the only one around to get her to the hospital, and that will spell disaster for him, her and the baby. They crash and Carly gives birth roadside to the baby, then dies from head trauma or something and the guilt is all on Michael. Okay, that may be a bit much, but it could happen on a soap!