There is a lot of judgement, criticism and mindreading in your recent posts about W. This is the right place to let that out but if you are carrying that with you all the time, it will drag you down. I understand where it comes from, why you feel how you do. It is understandable.
I read a while back that nicer people tended to be happier people.Do the nice thing BECAUSE it's the nice/right thing to do. It is not about whether she deserves it, it is about you being the best you possible.
I won't repeat what others have advised but you have gotten some good replies on this thread. Just remind me why W owns the car. Is it hers alone or did you buy it jointly? Regardless maybe you should look for more independence on the transport issue.
Best wishes
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together