i just went thru the same process.
Gasoline is unworkable. Did you calculate how many gallons per 24 hrs you would need? where do you store it? how do you keep it fresh? And you are refilling the gas tank a few times per day.
propane is OK if you have a giant tank-not one of those 20#.
you then will need a propane conversion kit for a gas engine, or a generator made for propane. i do believe yamaha has their own conversion kit, if you dont want a no-name.
I have city natural gas, so i chose a generac made for nat gas, and it's worked fine so far