When you rent a car with unlimited mileage, you do not pay for mileage. Your charge is the same whether you drive 20 miles or 2,000. This is a benefit to drivers who plan to take a rental car on a long trip or cover a large distance.

Rental must begin on or after August 19, 2016 and end on or before May 22, 2017. Offer rate of $9.99 per day applies to an Economy or Compact car rented on Friday and ending the following Monday, and includes 100 miles per day. For certain locations, rates of less than $9.99 per day may be available.

Most major rental car companies will let you take their cars across state lines, but not out of the country. You may have to pay an extra fee if it is a one-way trip, but if you're gonna return it to the same location that you picked it up from, it shouldn't be a problem. Avis allows out of state travel.