My family is low-car— I'm a four season bike commuter and my partner can largely get around during the day by walking and transit. Because we put less than 10k km on our car each year, I don't think buying a new Tesla or Prius makes sense for us, either from a cost or environmental standpoint. We were previously in a 2003 Volvo station wagon, and now in a 2013 Mazda 5. Neither of these cars is the most efficient on a per-km basis, but we're tackling that by just keeping the total number of km to a minimum.

Now, I am in Ontario where we have snowy winters, so almost all cars tend to rust out and be done within 10-15 years— it's not like the southwest where there are lots of truly ancient vehicles still being used as daily drivers. Perhaps the situation is different there.