If you are having a major car repair done and your car won't be available to you for days, or even weeks, ask the garage doing the repair to give you a loaner car to use while you wait. They may have loaner cars available for this purpose or they may arrange to get you a car from a rental agency. If they say no, call around to other repair shops and see if they offer this service for major repairs. It could save you hundreds of dollars if public transportation or a car pool isn't available.
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