hi forest. i believe it is set to calculate the actual amount of kw USED and how much fuel they draw. so for me, if i am running with all 3 air conditioners and assume that is about 33amps or 4kw, plus about 1kw for the blower motor and assume another 1kw in misc for a total of 6kw LOAD, for a usage rate of .5 gal per hour. so it may be off a little but in the ballpark.
generators burn more fuel when under heavier and heavier load.
tom
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