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Crude type will make a more or less acidic gasoline by sour crude containing way more sulfur than sweet crude. it is very hard to remove the sulfur completely therefore it is better to get gas that is made from sweet crude versus sour crap. les acid less wear and acidic oil to eat away at your valuable engine parts.
Refineries test the octane in the gas by running little engines and adjusting the timing, then they blend accordingly.
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