Thanks for the info Patchules.
The house is about 900 sq. ft. but one of the rooms is unfinished and unheated with only plastic sheeting up in both doorways leading to the room to keep the dust out of the livable areas. I've calculated my heating bills and it looks like I'll probably average 4.5 CCF per day during the cold winter months (nov-feb) which is high given the square footage.
I plan on insulating the unfinished room off from the livable areas since I can feel a draft coming from that room. Maybe just put up some styrofoam insluation in each doorway.
The attic isn't insulated and I doubt I'll be able to insulate the entire thing since some areas aren't accessible. I can easily insluate the two biggest rooms of the house as well as the back bedroom which has no insulation in the walls (just drywall over clapboard right now).
The ducts do run through an unheated crawlspace. I've taped up all retuns and any joints in the sytem to ensure that it is as airtight as I can get it. There were a couple of areas where hot air was pouring out of one of the ducts into the crawlspace
I'm hoping that insulating the attic and the back bedroom will help somewhat. If I find time and the motivation I'll put up insulation under my floor within the crawlspace too.
But I think I'll have to grin and bear it this winter. As long as gas prices don't spike I can handle a $150 heating bill if I have to but I should be paying maybe $100 at most for this small of a house.
If it's one thing I DON'T like about old houses it's this very issue.