If you're looking for an affordable and relatively lightweight generator that is fuel efficient and can run on either gasoline or propane, the Pulsar G12KBN is a great option. This generator produces 12,000 watts of peak power and 10,800 watts of rated power on gasoline, or 12,000 watts of peak power and 8550 watts of rated power on propane. It has a runtime of 12 hours (50%) on gasoline or 5 hours (50%) on propane. This generator is also relatively quiet, with a noise level of only 76 dB. It comes with a 1-year limited warranty and dimensions of 28.5 x 21 x 22 inches.