Refrigerators and how they cool

[seahunter]

Hello,

Our trailer will have the four-door refrigerator. We will not even fill one half of the fridge or freezer on most trips. In order to save on propane dry camping, would it do any good to fill the other side with something solid to take up space so it doesn't have to cool the entire refrigerator? I was thinking something like large blocks of styrofoam that would take up the space and be light. Not sure if the thinking is sound, so thought I would see if anyone knows if this would work.

Thanks a lot!

Greg