I have a Champion 4500 dual fuel. I have never put gas in it. It is plenty of power for the AC (which is why I have it) I can run 1.5 days or so on 1 20lb propane tank. It is much easier to get and carry propane when camping vs having to bring a gas can that smells and can leak or be messy. Also, propane is much cleaner and I don't have to worry about cleaning the carb which I would if I used regular gas. Which, by the way, all my yard equipment, etc, I only buy ethanol free gas. It's a little more expensive, like buying diesel, but removes many of the carb issues that I had before I started buying ethanol free gas.