The number you've quoted is about new cars. For used cars it could be 10 times less.
Under $8000 is easy, seeing as $8000 is average. Under $1000, I'm not so sure about. Maintenance/repairs on a new car averages > $1000/yr[1]--I'd assume used cars to be at least as high. Insurance average cost is similar. Fuel is going to be several hundred unless you have a very efficient car you drive very little.
I think people just look at their monthly car payment and ignore most other costs associated with car ownership. There are a lot of not-so-little costs. There are also lots of not-so-little benefits, but you need to weigh both, not just the latter.
[0] https://www.thesimpledollar.com/how-much-does-car-insurance-... [1] http://newsroom.aaa.com/auto/your-driving-costs/
Also, your second reference is also about new cars. I cannot believe anyone spending ~$1000/year on a maintenance of a 'new' car. First three years while it is still covered by warranty you will need an oil/filter change once a year and no new tires. $50/year at the official dealer was the maintenance cost of the last four new cars I owned.
Basically, learn to be comfortable on a reasonably low income. In the interview, he talks about biking as an example.
I've always been confused by single people struggling on much more than I lived comfortably on, and I recently realized part of it is that the average cost of car ownership in the US is something like $8k/yr[0]. (My first two years in Austin, I was in Americorps, so that would have been over 70% of my income.) That's just one example of a major expense we just treat as a necessity.
Maybe you don't want to live without a car. Maybe you want to go out to eat twice a week. Maybe you want a bigger apartment. Those are all fine--but those are also all choices that will raise your cost of living, which will likely push out your retirement age.
Personally, I don't mind working past age 30, but if you want to retire early, it will probably require arranging your life to live without things that might seem like necessities right now.
Again, totally your choice, and it might not be for you, but let me anecdotally provide that it's very possible to live a great life without a car, an expensive phone and phone plan, etc.
I'd recommend breaking down all your spending and looking at what you want to live without and what you don't. With things you can easily turn on/off (Netflix is easy to cancel for a few months, or biking to work for a couple weeks if you have a bike--car ownership or apartment size/location, not so much), experiment on living without and see how you feel. You might miss it and you might not.
Don't rely on my experiences, but don't rely on your guesses on how much you like the status quo either. (I guess that also means I should try renting a car and driving to work for a few weeks to see if I like it better than biking.)
[0] https://www.nerdwallet.com/blog/loans/total-cost-owning-car/