I remember I had 5 supermarkets between 5 to 10 minutes walking distance from my home when I was living in Milan. 100 meters in 1 minute is 6 km per hour which is a brisk pace so the closest supermarket was at about 400 meters. Of course I never drove to them, I always walked and came home with a couple of bags two or three times per week, usually at 2 PM when the supermarkets are almost empty. Water weights a lot and could be a reason to go shopping by car but 1) I always drank water from the pipe in the kitchen since I was little 2) I would have to walk to my home from where I found a parking place on the street and that was often as much as walking from the supermarket.
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