Don't understand that. Do you mean there is nothing else using gas during the test?
My guess is your figure is within experimental error, but at least it seems to show the gas input, and presumably heat output, meets the design.
BTW it's 9.0-9.4 kW, not kw per hour.
What has that to do with it? Transport is indispensable, and people have died in accidents even before cars came along - kicked by horses, drowned in canals, etc.