Tone,
I am not offended. I have a ‘thick skin’, as they say. I love to argue. If you show me I am wrong then I will learn something and I will have a better mind than before. I win. 
Do you understand octane ratings for all kind of fuels. a standard measure of a fuel’s ability to withstand compression in an internal combustion engine without detonating.The higher the octane number, the more compression the fuel can withstand before detonating.
So, what is this detonation? This is when an engine makes a bad sound, like a diesel, but in a petrol engine. You know your engine is breaking. But why does this happen? Because the air and fuel mixture is burning too fast and creating a pressure spike. This is bad for engines and wastes fuel.
Here is more discussion.
Rindert
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