We recently bought a new Daewoo 500 litre fridge, which had an advertised energy consumption of 520kWh/year (all fridges here are measured to an Australian standard so it's possible to compare). Of course I popped the power meter on it and left it running for a few weeks.
I found ambient temperature had a big effect on the energy consumption. Through a recent heat wave (5 days over 37C outside) the inside temp hit 27C for a few days. The fridge was using about 700 kWh/year. Guess it was also used a lot was we were drinking more and eating lots of ice blocks!
As the inside temp cooled the average power dropped beneath 600 kWh/year. So I figure we need to get closer to 20C inside to get the stated energy consumption.