GetRichSlowly.org has an article on how to eat at a nicer restaurant without blowing out your budget. One of my favorites is below.
Take food home. An excellent way to stretch your restaurant dollar is to actually plan to take home leftovers. Kris and I have done this for years, yet I don’t know how wide-spread the practice is. If you do this, keep it in mind when browsing the menu; some foods keep and reheat much better than others.
Plus it will save a little of your waistline if you don’t eat those huge plates of foods that are served in most places.