If you want to have petrol hanging around for an emergency such as a week without power, 20-40 L should do you. Store in a STEEL container: either those old square ones kero came in or a steel jerry can. Petrol will not deteriorate if air cannot get to it to begin the oxidisation process. All plastic ones, even the fancy ones, will permit O2 through the plastics molecular structure, and the volitiles will work their way out of the container, and O2 will work its way in.
I have a 205 full of petrol that's 2 years old. When I decanted it I put it into steel 20L containers. It smells the same as it went in, and it starts and runs the quad, generator and 2 wheeler just like the stuff purchased last week from the petrol station.
You can only store 49L of petrol before things get really difficult. 50L requires: be further than 15m away from a building, containers have to show the UN number for petrol, and have to have a fire extinguisher nearby, have a folder with the Material Safety Data sheet in it. There's more, but you get the gist of it.
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