From Wikipedia:
Octane rating
Quote:
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Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating. In broad terms, fuels with a higher octane rating are used in high-compression engines that generally have higher performance. In contrast, fuels with low octane numbers (but high cetane numbers) are ideal for diesel engines.
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Octane rating is all based on actual tests in real engines as shown at this very interesting link.
John,s Octane Engine Page
Adding Diesel to Gasoline is a
very Bad Idea.