. This thread started with the economic feasibility of converting lawn and garden equipment to propane. Now you want to debate therms. I can't take it any more. Uncle, you win, I am wrong, you beat me, I'm too old to battle the south end of a north bound skunk. I am going to do what I should have done to any salesman who try's to sell his product in any way possible, I'm walking away from this thread. Others will be able to read and make their own decisions. Time to let this thread die and wait for someone to to start a thread on converting my snowblower to be powered by an electric motor, with solar panels or wind turbine on top.