The Propane vs Gas Generator comparison can be interesting. First some gas generators may be converted to Propane. However you will lose a significant portion of the horsepower in the converted motor as Gasoline motors produce signifiantly more power when running on Gas than they do on Propane.
If you have Propane heat for your home or RV it might not be too difficult to hook up a backup Propane Generator
Propane normally does not have a Road tax involved so you can probably spend less on propane power.
Propane burns very clean with no . It does not foul spark plugs or the oil like Gasoline will.
Propane does not produce as harmful of exhaust fumes as Gasoline.
Propane does not degrade over time like gasoline does so longer term storage is not as much of a problem
Propane is more volatile than Gasoline or Diesel so a propane leak is a fire hazard.
Propane storage must be done in Pressurized tanks.
Propane storage tanks are not as convenient to move.
Transfer of propane between containers is difficult.
If Propane is handy for you to use a propane generator can make a lot of sense. Most Recreational Vehicles use Propane for heat, cooking and refridgeration. If you have a separate generator space Propane can be a good match.
If Propane is not already a fuel that you are using it can be a little more trouble to use a Propane Generator.
Commercially available LPG is currently derived from fossil fuels. Burning LPG releases CO2, an important greenhouse gas, contributing to global warming. LPG does, however, release less CO2 per unit of energy than that of coal or oil. It emits 81% of the CO2 per kWh produced by oil, 70% of that of coal, and less than 50% of that emitted by coal-generated electricity distributed via the grid.[citation needed] Being a mix of propane and butane, LPG emits less carbon per joule than butane but more carbon per joule than propane. LPG can be considered to burn more cleanly than heavier molecule hydrocarbons, in that it releases very few particulates.