-
I ran a 20KW for 170 hours after filling the bus fuel tank 2 miles away. At the end of the 170 hours I refueled at the same gas station at the same pump and took on 71 gallons. It was July weather in Oshkosh and I ran 2 A/C units continuously as well as refrigerator, water heater, and any other typical loads such as several hours of TV per day, the grill or cooktop, and phantom, loads.
That worked out to less than .5 GPH.
I have since rechecked consumption but on shorter periods of use at times when I could isolate refueling to just generator usage and the fuel burn stays around .5 GPH. Until your generator fuel consumption can be verified use higher consumption rates to be safe.