Belinda,
I have not looked at this site for a while and I noticed that you posted this question some time ago. So hopefully this reply is not too late. As part of changing car plans etc, I like to incorporate this in the process of introducing a Total Fixed Remuneration arrangement. Then all the value of cars etc is rolled up with super into the one salary figure. Unless tool of trade cars are absolutely necessary, I usually like to remove all company cars if possible too. Then employees have the flexibility to purchase through a novated lease or through their own arrangements what ever car they like. Your profile indicates that you are in manufacturing so some of these approaches may be seen as radical in your industry. What they do is remove most of the noise and constant
HR effort in updating company car lists and dealing with people whinging about their car. It also means that people look after their own car much better than the company car so insurance drops as well. Putting these changes in place takes planning but it is worth it in the end.
Regards Tas