Nice video Mike, I enjoyed watching it. I was thinking about load banking my Lister SR1 Kohler 3500watt generator head to compare to yours, but my neighbors would call the cops on me. There is nothing quiet about it with its factory muffler. Under normal operation it has run over six hours on a gallon of fuel, so it is likely a lot more efficient than your Onan diesel. One day I hope to record the fuel consumption of both my four cylinder Waukesha FC powered 10kw 1200rpm generator and my 1-71 GM diesel 10kw 1200rpm generator under varying load and full load. I am sure the difference between gasoline and diesel fuel consumption is going to be a factor of five or more.