If we look at portable generator fuel usage ... top pick from Champion runs for up to 5 hours at 50% load (capacity). That’s from a 7.7-gallon tank. So simple math will give us GPH: if we ...

Our average of how long a generator ran, over various loads, on a full tank of gasoline or diesel fuel, a 20-pound tank for propane-based portables, or a 250-gallon propane tank for stationary models.