Fair play to you Zman. I have some '0' days, like today and yesterday. Usually, it means that dinner/lunch is available at home and I don't buy newspapers anymore. I only use some diesel to drive to work. Sweet!
I stopped using budgets years ago. I only buy what is necessary and an occasional coffee or snack if I want it. Works out well. DW is the grocery shopper, on the other hand, and frequently bargain clothes shops, but she's not too bad really.