The problem is simple and the OP is not the first to point it out. When a new person that may indeed see car free as an absolute reads the title on the forum they get:
Forum: Living Car Free Did you
give up your car for good?
Is your bike and public transportation the
only way you travel from point A to point B? If your
only mode of transportation is your bike, discuss your car-free lifestyle here.
We have talked about this before, If being car free involves A: Giving up your car for good, and B: Your bike and public Transportation is the Only way you get from Point A to point B. Or C: if your bike is your only mode of transportation then you have a
car-free lifestyle.
You could modify the working definition in the title to be more inclusive if the goal is to get more people talking about using a Bike for transportation. You could also make a sticky explaining how many times and for what reason you can use a car, yours or not, owned or rented or borrowed and call yourself car free or call anyone who rides in a car, rents a car, drives a car once, or pick number, a day, week month or a year car light.
It is just that so often this forum tries to hit a moving target when defining car free. In this thread alone we have had definitions that do not fit the title at the door. But like the OP indicated it is a "Bike" Forum so it would seem we would be far more interested in how people have used cycling to modify their transportation habits than we would about walkers, runners pilots, cross country skiers, or whatever. They should have a forum somewhere you would think?