People can only fill their tank, so it's self-limiting.
Sounds like a lot of work to maybe save $50, but hey... mostly fun and games (unless you barn catches fire).
https://www.ricochetfuel.com/blog/dyed-diesel-fuel-vs-regula...
By UK standards, it was the middle of nowhere.
Diesel generally stores better, but it can have problems with algae growth.
> You can store up to 30 litres of petrol at home or at non-workplace premises without informing your local Petroleum Enforcement Authority (PEA).
https://www.hse.gov.uk/fireandexplosion/petrol-storage-club-...
In most states in the US its illegal to put gasoline in improper containers. This hasn't stop people from putting them into trash bins and plastic bags in fuel crunches in the US.