Is there any kind of unleaded fuel other than regular and premium?
Regular octane unleaded fuel can be used. When the instructions say ‘regular fuel’ they are referring to old leaded fuel. You can’t find that in the U.S. anymore. I’ve used it in a pinch and it does work. Just be sure to use a lid or your food will have a gasoline taste. Still, you can get white gas at just about any store. It’s designed for camp cooking and won’t flavor your food.