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Old 11-05-2013, 12:47 AM   #64 (permalink)
jeff88
Lots of Questions
 
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What changes the octane of gas? I've searched and searched, but the only thing I can come up with is how much ethanol is added. But according to the CARB website, the amount of ethanol is typically 10%. So is there something else that changes the octane? Is there more hydrogen chains in 91 vs. 87? Or is ethanol the major factor at this point?
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