SF does have somewhat lower car ownership than the average American city. I know a couple in SF who don't own one. Though I'd observe that, in addition to muni

SF does have somewhat lower car ownership than the average American city. I know a couple in SF who don't own one. Though I'd observe that, in addition to muni and some cycling, they lean heavily on Uber, Zipcar, and conventional rentals so they're carless mostly in the sense that they don't own one and have to park it but they certainly use and drive cars in some form on an ongoing basis.