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I'm curious how much extra it actually costs refiners to produce 87 vs 92 octane fuel? They reduce the octane of the gasoline they blend with E10 so that they aren't giving away octane for free.
Starting to come around on the ethanol subject since there is plenty of evidence that an engine built for high levels can be very powerful and efficient. I stick to my assertion that the market would have built this already if power was improved and cost of fuel per mile were cheaper. More power for cheaper; that checks everyone's boxes.
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