You have alot of room for improvement!
To compare my 1920's house to your 1920's house, only mine is 2,600sf... I used 105 therms in Dec 2009 to heat and 500kwh, my electric is so high because unlike you everything in my house is electric other then space heating is natural gas, but you can see your gas usage for cooking and water heating in the summer is a fraction of what your heat is.
First thing I would do is get a Kill-a-watt, or other energy meter, check your libery to see if they have any to loan out, if your fridges are old it might just pay for it's self in a few years by being more energy efficient, do that with everything in your house until you've figured out what is using so much.
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