Why are there so many options for vehicular gasoline at the pumps and what’s even the difference between them?
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In order to extract the most amount of energy from gasoline, it’s first squeezed and then ignited. Under some conditions, gasoline might ignite itself. Ignitions must be in sync, so self-ignition is unwanted. Higher gas number means the fuel is harder to self-ignite.
Some engines are built to take squeezing to an extreme, so high number fuel is necessary.
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