$35 for 6 meals for two people at McDonalds? What?
Where I live, one meal at McDonalds is about $12. So 6 * 2 * 12 = $144. Not that much of a difference.
Also, if you aimed for 2200 calories per person per day with that $170, then it isn't really fair comparing to a single McDonald's meal, is it? It sounds like buying whole foods is cheaper.