Maintenance, insurance, etc. are largely fixed costs: you have to pay the same for them regardless of how much you use the car. (Pity for me, I've got an 8 year old car with < 30k miles on it.)

Parking in the suburbs is subsidized by business owners & the city itself - you can usually park for free, and the price of it is reflected in land values.

Gas is the only marginal cost for suburban driving, and I can basically guarantee that Uber costs more than gas does. The marginal cost of driving across Silicon Valley, in gas, is under a dollar.