Another dirty little secret about rental cars and insurance:
Even if you buy their insurance, if you also have personal car insurance at home, it will kick in first (up to its max) before the additional insurance you purchased at the counter kicks in.
Needless to say, we always decline counter insurance. It also makes me mad to hear those rental car people talking customers into buying gas like it's some great benefit. Unless you were to turn the car in fully empty (you are charged for the full tank regardless), you do not save any money, no matter how much they try to scare you with the rising cost of gas. I look them in the eye, tell them I'm a frequent renter, and say no thanks. That usually stops the spiel. But sheesh, are they paid on commission or what????