I'm afraid to figure it out.
I actually *do* 'eat out' fairly often (89% of that time, though "eating out" = making a salad at the salad bar in the produce section of my market @ $6.99/lb). BUT I do have my own rules for saving $$ at the grocery store...
* Buy fruits and veggies in season when they're CHEAP (right now strawberries are getting cheap around here, yum!). Better yet if you have a local farmer's market check it out because often prices are lower than at the stores.
* When something's on sale that you can freeze/store, I stock up BIG TIME - example - boneless skinless chicken breasts are on sale every so often for $1.99/lb (sometimes even lower but not often). I buy 'em (they come in the big bonus trays), divvy them up in GladWare or Ziploc freezer bags, and toss 'em in the freezer. Same with steak.
*I'm not a big fan of frozen vegs, but they're okay to use in soups and that sort of thing, Safeway has buy one get one free on those a lot, so I stock up.