Glossary

Unlimited mileage  is the no mileage restriction when renting a car. This is the best way to go, as a time-and-mileage rate CAN be very expensive when you add up the additional mileage charges ( can be as high as 25-cents or more per km ) should you run over the agreed-upon limit.

Unlimited Mileage
(UM) Unlimited Mileage ensures that you can travel as many kilometres as you wish during your rental, free.

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Other definition:
Unlimited mileage is the option offered by car rental companies where, for the agreed price and time period, you can drive the rented car without mileage limits.