"octane" is a "derivative" measure - which describes how much compression it takes before the fuel detonates without a spark....
the higher the octane, the higher the compression the fuel can withstand before detonation.....
many modern cars have higher compression engines - therefore they require higher octane fuel.
If you put low octane fuel into a high compression engine - you will hear "pinging" cause by pre-mature fuel detonation (due to the high compression chamber detonating the low octane fuel)...
This is why running low octane when your car requires high octane can damage your engine...
What I do not understand, is what effect is there if there is MORE octane in fuel than "expected"... my guess is that it allows you to run higher compresssion .....
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