When I was married that was how we did it...I organised all the bills to come out around the 2/3rd of the month and then worked out hoe much I spent on groceries etc per week and tried really hard to stick to that!

Cate - can I just ask...do you really fuel up your car and it lasts a month??? I'm lucky if I can squeeze a week out of my tank!
I have 2 tanks .. even tho we live in a small country town i go to DH work atleast 3 times a week and thats 15 minutes away and we always go 4WD on the weekends. def helps having 2 tanks tho.