Last Updated on March 7, 2026 by Kristin
You can’t beat the freedom a rental car provides. But before you start daydreaming about a cross-country road trip, there may be one big restriction you know about when it comes to rental cars. You should confirm the number of miles you’re allowed to drive. So what is the maximum number of miles you can put on a rental car when you have ‘unlimited miles’?
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Most car rentals in the U.S. do not have mileage limits, which means, in theory, that you can put as many miles as you want on the vehicle. But there are sometimes exceptions.
Mileage Limits Vary Depending on The Rental Car Contract
Most standard rental cars in the U.S. include unlimited mileage, but some rentals—especially specialty vehicles, promotional rates, or certain one-way trips—may come with mileage limits. Here are a few of the most common scenarios.
Unlimited Mileage on Rental Cars
With unlimited mileage, you can drive as far and as much as you want during the reservation without additional charges. Major car rental companies usually display this information when making a reservation.
But be forewarned. Unlimited mileage doesn’t always mean truly unlimited. Sometimes rental companies cap the distance you can drive over a certain period of time. For example, you might have a daily restriction for short rentals but unlimited miles if you rent for a week or longer. Before testing the limits of “unlimited,” it’s smart to read the fine print of your rental agreement.
Know also that you could end up on a rental company’s Do Not Rent list if you are a serial long-distance renter abusing the “unlimited miles” policy. For example, reporting suggests that Hertz, Dollar, and Thrifty may review rentals exceeding roughly 3,500 miles within 30 days.
Another example: Enterprise’s FAQ page on “unlimited miles” spells out that unlimited mileage is available for most car classes in the U.S. and Canada, but there are exceptions.
- Larger or specialty vehicles (such as large passenger vans, large cargo vans, large SUVs or Exotic cars) come with limited mileage and an incremental cost for every additional mile/kilometer over the allowed limit.
- Unlimited mileage doesn’t apply if you booked a promo weekend rate available during select months at off-airport locations.
Mileage Limits on Rental Cars
While mileage limits are the exception rather than the norm for U.S.-based car rentals, you may occasionally see some rates that include caps on how far you can drive.
In general, one-way rentals don’t have mileage restrictions. But be wary of promotional fares, like certain one-way rentals designed to get you only from the airport to downtown, which often have mileage caps.
You may also see mileage limits for long-term rentals. Europcar, for example, says that rentals for 28 days or more automatically have limited mileage.
Zero-mile Rentals
In rare cases—particularly outside the U.S.—some rentals charge per mile from the start. These tend to be trucks or other more specialized vehicles.
Don’t Get Stuck With Geographic Restrictions
Just like with mileage limits, geographic restrictions are uncommon. However, they do exist. Fox and Sixt are two examples of car companies that may implement geographic restrictions on their rentals, depending on the state.
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Geographic restrictions are also common for rental reservations near international borders. Even if you have an unlimited number of miles to burn during your reservation, most rental car companies won’t let you cross into Mexico from the U.S. without purchasing additional insurance.
The Bottom Line
Before renting any car, be sure to check for any mileage restrictions as well as geographic limitations your vehicle might have.
One easy way to do this is to ask AutoSlash for a quote on your next car rental. The process is free, fast and easy. When renting a quote you’ll be able to find the best rentals with unlimited mileage, and get a heads up when rates have mileage caps.
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