How Many Miles are Included with the Rental? Silvercar May 30, 2018 15:54 Updated Your Silvercar rental includes unlimited miles at no extra charge. Related articles Are there any Geographical Restrictions? What grade of fuel does the Audi A4 or Audi Q5 use? On my first rental, is there a check in process? Do I need to inspect the car at the start of my rental? How do I use my smartphone to select and access the Silvercar?