Okay: in the absence of ethanol-free gasoline, you can run a gasoline-powered generator with fuel that has up to 10% ethanol. But you will shorten your generator’s life, and as long as you live in Florida, you’ll need it again. Try to fill your generator with ethanol-free gasoline!
My recommendation: Try and find a gas station that sells ethanol-free gasoline. Wawa is a reliable source — use their store locator, select Advanced Search, and check the Ethanol Free checkbox and run the search!