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Is it better to borrow my parents' car rather than purchasing insurance for a rental car? My partner and I are planning a three-month trip around the U.S., and we plan on renting a car because we don’t own one ourselves. I got a good deal for a rental, but the insurance is more than the cost of the car. Alternatively, my parents have offered to let us borrow their car—but it has 150,000 miles on it.