That's a tough question to answer: to give personal numbers I think I immediately saved something like $1,000/year in 2010 money back when I went totally car-free. But in the 5 years I had that car the average was probably closer to $2,000/year since the amount I drove had tapered down to near zero in the last year I owned it, and I'd had some expensive repairs done once after a minor crash on an icy day.
To give a somewhat better number, I bought another car at the end of 2020 and it costs me around $750/year which is probably about as low a number as you can get where I live. To put that amount in context, I bought a fuel efficient car very inexpensively for cash, drive it maybe twice a month on average with a few long distance trips per year, do the bare minimum of maintenance to keep the engine running, and have the least expensive insurance possible.
Also, on the other side of the balance sheet, I've always kept my annual bike commuting costs below $100, and back when I started I was more than offsetting that by flipping bikes from my garage in my spare time.
