There is a gadget called a Kill-a-watt that you plug into the wall and plug the device into it. It measures killowatt consumption for anything plugged into it. I recall it being mentiond on TOTV before (probably dealing with electric golf cart battery charger consumption). I did buy one from an online site.
If you are real curious about the freezer electricity consumption, you're welcome to borrow it for a week or so to measure.
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Maryland (DC Suburbs) - first 51 years 
The Villages - next 51 years
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