We can offer a free car almost every time. In 95% all reservation requests are answered by a proposal accepted by the customer. This is quite a lot, regarding the fact that 2/3 of all rides are booked just a few hours beforehand. So, if you reserve a little bit earlier you'll have the full choice.
On peak times however (such as Easter, Pentecost or Christmas) or in summer holidays the number of requests is still higher. We therefore add vehicles form car rentals to our fleet in these days.