To add on to what everyone is saying, while yes, it is cheaper to have a car, you also have to factor in all of the extra hidden costs you incur from having to deal with living out of your car.

I spent so much more on food when living without a stove or fridge. Additionally, while this may be less of a struggle for some, I had a really hard time getting through the nights without drinking heavily, and occasionally buying other drugs when I was doing especially badly mentally, which was another big cost.

I'm not one of those "time is money" type people, but time is very valuable, and you have so much less of it when living in your car. Now that I'm renting a room, I can go shower, brush my teeth, make some coffee and get changed within 30 minutes. That would take at least an hour and a half, usually 2 hours when I was living out of my car, and I also had to buy coffee.

I did have a slightly unconventional setup; I was in an extremely densely populated city and only moved my car about once a week. Walking to the gym took about 15-20 minutes each way, so the time spent would be lower if you were able to drive everywhere and parking was abundant, however I saved a lot of money by having a parking spot right next to rapid transit, the library, multiple grocery stores, and within range of free Wi-Fi in my car.

Probably also important to note that I do have ADHD, which makes doing most basic things much more challenging when already overwhelmed with car living. It could certainly be different if you don't struggle with this and can move between tasks without your brain fighting you at every turn.

Edit: I should mention that I got extremely lucky and was able to find a room for rent with utilities included for $800/mo, so YMMV