Mark I'd be interested in your experience if you committed to not driving in a car for a one week period.
For example, when you head to the markets you don't take the car but instead grab the carry bags and use public transport (or walk if reasonable), then carry those groceries home.
I had a similar experience a few years ago when I had to work interstate. Being a 1 car family I left the car with the wife and had to use public transport or walk everywhere for 3 months. What a change in lifestyle that was, and mainly in a good way.
Anyway, you give us lots of challenges, thought I would throw one back at you.