Does anyone have any idea about how much a person is liable for if they rent a car from a place such as Avis, Hertz or Thrifty without paying for the insurance coverage they offer? A friend of mine doesn't have her own car so therefore she doesn't have any insurance. She is renting a car for the weekend and wasn't sure about her liability with or without purchasing the insurance coverage thru the rental agency. Any answers would be great as we all know that those rental insurance programs offered by car rental agencies can be quite expensive:-)