This may seems like an odd question but thought it was interesting.
A few times in recent years I have been without a car. So how did I get around? You guessed it...my bike!
When I didn't have a car there weren't any excuses for not commuting by bike...if I needed or wanted to go somewhere, it was by bike or I wouldn't go. The interesting thing is I never minded with a few exceptions when the weather was bad. But even then I felt "empowered" when I did it!
Now I have a car again and when I need to go the post office, bank, store or wherever, I reach for my car keys until I stop and think "do I really need to drive?". Then I get my helmet and bike lock and head out the door.
Now, there are times I am tempted to drive the car and sometimes I do, but at the end of the day commuting by bike is "a state of mind".