It took me a little while, but check this out: Last year, from September 2006 through March 2007, we burned through 900 gallons of oil. Average price was $2.37 per gallon, which means we spent $2155.70 on oil in a 7 month period. This year's price for oil in my area is $3.19. So, if I was to burn the same amount of oil, I would spend $2871 for the same time period. That was keeping my house at 69 degrees. Here's what is awesome. With my Enviro Empress insert installed, I have spent a total of $320 on pellets since September, and it is now the end of December. Based on that, I'm predicting to go through 2.5 tons between now and March. At $240 per ton, that is $600, for a total of $920 to keep my house at an average temperature of 72 degrees vs 69 degrees. I bought 100 gallons of oil in September for $265, and will buy another 100 gallons mid January, most likely for $319. So, in total to keep my house at a comfy and warm 72 degrees this Winter season, it will cost me $1504 versus $2871 and 69 degrees. So I have one thing to say to the oil companies. Kiss my Enviro.