a standby propane generator can run for several weeks. Compared to natural gas, propane generators are more fuel efficient, but they lose out to gasoline. Depending on where you live it may be ...

The basic idea here is that you feed natural gas (though propane should also work ... of gas when the engine stops running. So if the generator stalls or you just forget to close the valve ...

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.