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ethanol is used to "oxygenate" the gasoline. Since MTBE was removed they needed something to replace it for smog reduction and this is what they use and yes, it does have an adverse effect on the fuel economy in gasoline burners. Because it relates to smog, in some places it is mandatory and in some it is not so it is possible to find lower concentrations in more rural areas.
It is NOT added to diesel fuel.
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Marty D.
2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz
Last edited by nhdoc; 08-30-2009 at 08:18 AM.
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