Good points. I also heat with wood in a northern clime, and this seems accurate. I'm a little confused by the units and the costs, though. I cut my own, so I'm not sure how much a tandem truck holds, but am I right that your $1500 CDN load of sawlogs ($1100 USD) is enough for several years of heating? My quick search suggests that a tandem load might be around 12 full cords (44 m^3), and thus be enough for 5 years for you. Is this about right?