Love the car! Won't win the race w/all that wind drag, but who cares? It is cool!
Hey as far as your cost thing goes, my XW and I have a verbal agreement to split costs, but we all know how strong those are. So what I do is get our conversations on text or e-mail for backing and simply beat her to the punch. If she says "D wants to do X and it costs $50..." I'll pipe right in and say, "so when should I give you the $25 check to cover my 1/2?"
You may look at some of the same w/your XW when something comes up. If something is $600, just say "I'll put in my 1/2 next week. You'll need to let them know when you are picking up the other half" or whatever and leave it at that.
I agree w/Gypsy that this is the one where you'll need to use your intellect and get the upper hand in whatever way is most comfortable for you in your relationship w/XW.
I'm glad to hear you are doing well and the gym thing sounds sweet! I'm looking for a new gym for myself as well as I've been off the wagon w/DC, the move, and the "settling in period" of unpacking, sorting and putting away.