Same thing I tell maggie… we have a similar sized house with a newer design furnace… we had some high gas bills, but they even out thru the rest of the year. I had one bill that was that high this winter when we moved in, but I use electic space heaters in smaller rooms to keep from having to use the gas. I havent had a gas bill over 35 dollars since like april or so.
You have to remember they do also have economic plans where you pay a similar price all year round. Stil sounds like something isnt efficent in the house, how new are the windows?
edit* just saw the post above.
Would have the inspector check duct work that he can visibly see as well as check over the furnace.