Once running, you can view important information on an easy-to-read LED display that lists the total hours the machine has run, the fuel level for the gasoline tank (there’s no gauge for propane), and a load gauge that uses a bar graph to show power output level—knowing that helps to avoid overloading the generator. You may hear generators like these referred to as “open frame” generators, which simply means that the engine, fuel tank, and generator components are not enclosed in bodywork. Trevor Raab When powered by propane, generators run cleaner and more quietly, but they also produce slightly less power than gasoline-powered generators.