Don't forget those numbers are for a household so that would likely include a baby who demands higher temperatures in the winter than we would. Everyone that I asked who has a kid says that if they bundle their kid up any more than they do in order to keep the temperature below 72, then the kid gets too warm and sweaty after being too cold, its hard to regulate the temperature but at 72 they can have fairly normal clothing and still be fine. This would affect natural gas usage quite a bit.
Electric usage in terms of lights seems minimal to me to have a few extra rooms turned on with CFLs. Running more lights, another computer or a hair dryer, microwave, or toaster from time to time wouldn't double usage over base load appliances like a refrigerator, air conditioner, furnace, etc.
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