No, I don't think he is calling you a liar. I don't think anybody in this thread is being called a liar. What is being pointed out is very simple.
To prove somehting it must be repeatable. A 2 engine test does not prove anything. Perfect example, I have had identical OS engines live for 2 gallons and for 8 gallons and others go in between these numbers. Same fuel, same conditions. All in proves is there is a spread of gallons you are going to get off an off the shelf engine.
Ed M.
BTW, thank you for your service to the country.