How long will a generator run on a tank of fuel?
This depends on the size of the tank and amount of load on the generator. Higher loads require more fuel. A 6000E portable will run for 9 hours at rated load, a 5000E portable will run for 11 hours at rated load, and a 4000E will run for 13 hours at rated load. Many users average 10 15 hours on a 6000E under normal usage. A conservative rule of thumb is 1 gallon of fuel per hour for a 5,000 watt generator. Propane fueled portables use a slightly larger amount of fuel than their gasoline counterparts.