I leave fuel in my car for months on end and don't have any problems. It's usually Shell PULP, 98 RON. This used to be called Optimax in Australia, which used to go off after a few months, but it seems they fixed it up.
If you think about it, if petrol went off after only a month their would be lots of cars in long term car and parks that wouldn't start. That certainly doesn't happen here in Australia.
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