Since the official estimated cost of feeding a family of four in New York City today is $66.41 per week, Mrs. York is way ahead of the game. She can even boast that her family eats meat, fish or fowl every day, though the portions are small--one pound of fish fillets for four--and there are no second helpings--ever. In fact ""don't coddle yourself"" is the byword. However a great deal of her advice is both smart and sensible for people who have to get maximum nutritional value from minimal budgets: convenience foods from potato chips to canned spaghetti are absolutely verboten (""TV dinners are the biggest tip-offs in modern times""). She saves coupons, uses chuck instead of sirloin, Velveeta instead of cheddar, iced tea in place of sugared sodas and buys all her meat except ground chuck on special. But you may wish to draw the line on her coffee-making technique (""I use only half as much coffee as recommended. I find that my coffee tastes smoother"") and if we served our immoderate husband one piece of bacon for breakfast he'd throw the pan at us.