Oh Shay I am completely with you there!! I get zapped by EVERYTHING. My car electrocutes me all winter long. But I found it was 100% tied to what I wore. A specific jacket of mine would ALWAYS get me zapped but if I changed to another jacket I was safe. I just wore a shawl (a nylon one I think) all day yesterday and I was zapped constantly. I changed out - I'm fine.
So I really don't think it's the car seats. Look into the jacket you're wearing or the clothes. That is probably the problem
Julie - I really don't want to add vinegar to my clothes. I hate the smell