If you get a car rental upgrade, you will usually get a larger vehicle than booked.

With the free upgrade, you will be offered a higher class vehicle at no additional cost. This is often the case if your booked car class is no longer available.

Of course, you can also voluntarily opt for a chargeable upgrade on site

Beware! Some on-site rental companies use hard-sell tactics to get their customers to opt for an upgrade. If you are not interested, firmly decline the offer and do not get involved in discussions.