It's really not this simple.
While it's true that a 10% full freezer will use more energy, because the compressor turns on more often, it doesn't make any difference if it's 50 or 99% full. (I verified this after I bought my massive freezer, and slowly filled it)
Also, very, very importantly.
The value of goods in your freezer is almost always significantly more than the electricity used to freezer them!

If you save 3 pounds a year by reducing the energy consumption by 10%, but now can't fit 20 quids worth of half-price stuff you usually buy in it, you just lost 7 quid.
If this happens more than this over the year - fail!
(speedevil, Fri 11 Nov 2011, 11:53, 2 replies)

I just liked the idea of hacking large blocks of ice apart, to cool drinks.
Good to hear that I'm already quids in.
( monster munch person, man, woman... camera... TV?, Fri 11 Nov 2011, 12:18, closed)

I can't quite get my head around what you are saying there.
Surely you take out the giant ice cubes to make space for the food which you want to put in, as and when necessary?
Also, wouldn't you lose £17? Or have I firmly grasped the wrong end of the stick here?
( Pig Bodine., Fri 11 Nov 2011, 12:46, closed)