Posted by Owen Aaland on March 25, 2011 at 23:24:50 from (65.165.246.110):
In Reply to: ethanol questions posted by Bob Bancroft on March 25, 2011 at 16:50:34:
The common practice is to blend the alcohol into the gasoline as it is loaded into the tanker truck for delivery to a station. The shelf life for ethanol is considered to be about three months. As noted in another post, in high humidity conditions problems may start to occur much sooner than three months.
Ethanol is hydroscopic. If stored in unsealed containers it will absorb water out of the air. This absorbed water will mix with the alcohol. When the water contamination reaches about .5%, separation of the water/alcohol from the gasoline will occur. That is only about one tablespoon of water per gallon of ethanol.
Alcohol is used to increase the octane of ethanol fuel. Once separation occurs the remaining gasoline may have an octane rating in the 70s.
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