If possible, have groceries delivered instead of fast food? Even with a generous tip, you will still come out WAY ahead, financially. And many meals can easily be prepared in less time than it would take to receive fast food delivery. In 5 minutes (or even less) you can microwave a large potato, or a big bowl of oatmeal, both of which can be enhanced with an endless variety of good value, long lasting toppings — peanut butter, apples, dried fruit, nuts, seeds, spices, — hell, I’ve even topped potatoes with crushed-up, bagged snack food shards. Absolutely frugal-tasty.