Posted by Indiana Ken on October 10, 2013 at 17:17:57 from (66.249.233.14):
In Reply to: New Gasoline posted by David G on October 10, 2013 at 15:42:36:
Quoting Removed, click Modern View to see
It was my understanding that "most" gasoline was being refined to 84 and 91 octane levels. The big deal with the lower octane (84) is that it is cheaper to produce, as another poster noted. Also, ethanol is cheaper than gasoline on the commodities market so adding ethanol gets you 87 octane - very cost effective. IMHO, this is the best kept secret in the oil business.
84 + 10% ethanol = 87 octane.
84 + a splash of 91 + 10% ethanol = 89 octane.
91 + 10% ethanol = 93 octane.
For ethanol free gasoline:
84 + a splash of 91 = 87 octane
84 + 91 = 89 octane.
91 = 91 octane.
I have seen 93 octane ethanol free gasoline and have always been puzzled if that is a special run truck load or what...? The Renewable Fuel Act passed back in 2007 required a minimum number of gallons ethanol shall be blended per year. The number increased over the years however the petroleum industry has blended far in excess of the minimum requirements. If they have met the minimum they do not have to blend additional ethanol. OR - perhaps they feel there is a market for non-ethanol gasoline and have decided to simply pay the fines.
Perhaps someone else closer to the industry can comment.
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