I always find those budget things annoying, too. I don't drink Starbucks at all, so dropping a coffee a month isn't gonna make a difference. Iced tea and Coke are a lot cheaper.
We don't go out to eat much, and when we do it's fast food, etc. And I don't buy a ton of new books and CDs every month. I'm not sure who these people are that they're writing it for, but they sure aren't me!
I think McDonald's is taking the wrong tact if they're trying to convince people that minimum wage is enough to live on. It probably usually isn't. But the thing is that minimum wage is a great starter job or a side job. When you first start working, you're unproven, you don't have any particular skills, and most companies aren't gonna take a risk on you. Doing a minimum wage job lets you start building your resume, getting references, etc. THAT'S the argument McDonald's should be making.
We have a family of 6, and I think we're at about $600 a month or so. We don't go overboard, but we don't cut corners, either, so I'm sure we could get by on less if we needed to. But I buy plenty of berries in the summer while they're in season, etc., so there are definitely things that we could go without if we needed to.