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@Dammit
If it's turbo charged or high compression then as has been said, high-octane fuel is pretty much essential.
Detonation/knock can kill an engine really, really fast - typically by the time you realise something is going wrong the engine needs a rebuild, or binning.
The other thing to mention is that whilst a modern engine management system is clever enough to work round poor fuel it'll burn a lot more of it in the process, so you'll have worse fuel economy AND less power than you paid for when you bought the car.
It's very much a false economy, unless it's a shit-box and you don't give a fuck if you shatter a piston and then throw the rod through the engine block.