As well as using a real clock and not the tractors clock, as I've been told that some tractor clocks vary with rpm's.Yes, to compare some parameters need to be established......like @540, under a load, etc... Probably need a minimum number of hrs operating to calculate fairly accurate fuel usage.....like at least 4 hrs?
That's my 2¢, I'll "SHUT UP, SIT DOWN" now.
Ron