Hi there. I'm Neal. The author of this analysis. As I recall, I included the cost of gas, and wear and tear in maintenance. The largest cost of cars is depreciation, and that's kept me from buying a car. The only car I would want (a nice car) is going to depreciate faster than I'm comfortable with. Since doing this analysis I've been carless for 2 years and have used Uber and google buses a lot to get from SF to Sunnyvale where I work and fly planes. Since writing I've used Getaround a few times and Turo never. There's a Getaround next door to me (a nice Volvo) and taking that is often less expensive than uber, but less desirable because I've gotten very addicted to the pleasure of not driving the car that I'm riding in.
I like your suggestions here. I've considered buying a car and renting it out like you suggest, but I currently make $100,000/year doing that with the extra room in my SF house, and that's enough work that I can't afford to extra time to do it with a car also. And I think I'll make more money on Airbnb vs. Turo/Getaround. Homes are easier to monetize than cars.
Again, thanks for digging in!