When gas prices sky-rocketed a few years ago, our employer allowed almost everyone to go to 4 - 10 hour days to make it. I was, and still am, one of those who are not allowed to do that. I do not drive on the weekends. I get all of my running around done on the way home after work or during lunch. I have tried car-pooling once before, and it just didn't work out very well. I live 20 miles away from my work, and there is only one other person who lives close by (she's my bestie). When we tried to car-pool, my kids started having problems getting back and forth to work, so I had to run them around too.
Can you imagine how drastically our gas needs would be reduced if we operated the way things did in the old days? All businesses closed on Sundays would make a tremendous impact.
If all who are able to would go to 4 days a week, how big an impact would that make? Well, nevermind, we would all have more free time to run around then, wouldn't we? It would make a difference if the school systems across the nation went to 4 days. That would save a ton of diesel fuel!