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In Germany:

When using vehicles, unnecessary noise and avoidable exhaust pollution are prohibited. In particular, it is prohibited to run vehicle engines unnecessarily and to close vehicle doors excessively loudly. Unnecessary driving to and fro within built-up areas is prohibited if it causes a nuisance to others.

§30 (1), StVO

Where do you live, OP?

In Denmark it goes in the same category as not driving when the light is green or keeping to the left on the highway.

While you seldomly see someone get fined for it, taking more than two turns in the roundabout is considered an obstruction of traffic, and therefore illegal.

You’d need to refuel at some point and I expect that refuelling whilst in motion would probably hit some legal issues.

And then, assuming that you overcame that, in the UK at least, you’d need at MOT test at some point, which would have to be at an approved test centre, so 3 years at the absolute max - although I expect tyres etc would need attention before that.

I suspect that when your car runs out of gas and stalls in the middle of the suicide circle you could get a ticket for blocking traffic or something.

Obviously it’s all going to be dependent on local laws, and depending on their vagueness the attitude of the cop that eventually has to deal with you. Here we have a catch-all ticket for “wasting finite resources” for cops to use when they don’t know what else to ticket you for. Originally it was to stop cruising, but I’m pretty sure no one has gone cruising since gas was $0.25 a gallon. Also I’m wondering if I could fight such a ticket if I can prove I charge my car with 100% solar.

In Norway, there’s a specific “law” against causing dangerous situations by being inattentive, unpredictable, inconsiderate or reckless. Needless to say, it goes unenforced a lot, but if you wanted to nail someone for driving like a dipshit, it’d be a decent catch-all.

You could probably stay on the magic roundabout until you ran out of fuel.

But I doubt you could go all the way around a mini roundabout .

The UK Highway Code is focussed on good behaviour when using one. There doesn’t seem to be a rule.

if you are without food or water you become incapable and that is illegal

It’d be called ‘obstructing traffic’. Police sometimes grab boy-racers along the sea-front near my home for it. There’s no specific law saying you can’t wait at a T-junction indefinitely, and i usually get stuck behind the ones that do. :-(

i sometimes take an extra trip through the roundabout if some asshole is driving way too close to my rear and refuses to overtake

Look kids, Parliament, Big Ben!

European Vacation - Roundabout

Illegal in my country, as you are disturbing traffic. Potentially even preventing emergency services to operate. Might be fine if you are alone though