Fridge/freezer question - trying to eat what we have on hand, but too empty?

[AmyAnne]

I seem to recall that the fridge and freezer should be kept somewhat full, so that it operates more energy efficiently. I am trying to eat what we have on hand, but the freezer especially is getting pretty empty. Should I fill some bottles with water and put them inthe freezer?

 

[disykat]

Can't hurt! I always do this when I have room in my freezer. In case of a power outage things will stay cold longer.

 

[NorCalGal]

I have heard that you shouldn't leave your frig or freezer too empty as well. I do what the PP mentioned - when the freezer gets empty I put in gallon jugs of water. If I'm emptying out the frig for a long trip, I start putting in things that don't necessarily need to be in there - boxes of cereal, etc, in addition to water. (I live in earthquake country, and if the big one hits, I will have plenty of water)

ETA: I heard that it uses less energy to operate your frig if it isn't too empty or too full