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To: Peter Dierks who wrote (41086)9/9/2005 4:19:00 AM
From: Elroy JetsonRead Replies (1) | Respond to of 306849
 
Ethanol does contain less energy than gasoline but that is not why its used.

Ethanol is the least expensive additive to add octane (retard premature ignition in high compression engines) and add oxygenation for clean burning.

If all ethanol subsidies were replace with a 40% tax on ethanol, refiners would still use ethanol to raise octane and meet clean air requirements calling for oxygenated gasoline.
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To: Peter Dierks who wrote (41086)9/9/2005 6:28:21 AM
From: Elroy JetsonRead Replies (1) | Respond to of 306849
 
To achieve octane and oxygenate ratings, refiners produce gasoline which contains less than 6% Ethanol.

In some special situations, as much as 10% Ethanol will be used, but this is quite rare.

E-85, containing 15% Ethanol, is a promotional boondoggle driven by tax breaks. It has nothing to do with mainstream usage of Ethanol.
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