What does Liberty Mutual mean by only pay for what you need?

What does Liberty Mutual mean by only pay for what you need?

Liberty Mutual ByMile. ® Liberty Mutual’s new low-mileage driver program, ByMile, gives you the flexibility of only paying for the auto insurance you need. All the coverage of a traditional auto policy, but at a fraction of the price because your rates are customized based on the number of verified miles you drive.

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