Easy to use calculator that compares the cost of your heating options where you can input the local fuel prices and the type of heater. Even gives you good guidelines on the efficiency for different heaters. In put your options and see a cost graph!
(https://i56.photobucket.com/albums/g166/jraabe/wood.jpg)
(http://hearth.com/econtent/index.php/articles/fuel_cost_comparison_calculator/)http://hearth.com/econtent/index.php/articles/fuel_cost_comparison_calculator/
(https://i56.photobucket.com/albums/g166/jraabe/wood2.jpg)
sample chart
I like to simplify mine. Hardwood - free - softwood free - my time is worth nothing... chain, gas and oil -say $50 per year -
Cool I just save about $1000. :)