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Politics : Politics for Pros- moderated
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To: DMaA who wrote (212891)7/21/2007 11:48:53 AM
From: miraje  Read Replies (1) of 794040
 
Ethanol is both an oxygenate and an octane enhancer, although one suffers a small mileage penalty with E10 and a large one with E85. Its introduction to gasoline blends was originally due primarily to oxygenate requirements. MTBE additive accomplished the same thing, though it has subsequently been banned because of ground water pollution issues, leaving ethanol as the only reasonable oxygenate alternative (one that is no longer necessary).

Lead was a cheap and effective octane booster. Unfortunately, it was also environmentally destructive. Good riddance to it. Pure gasoline can be produced with high octane levels but requires more expensive and extended refining to accomplish.

Modern high compression and performance engines will run on low octane gas, even when premium is recommended, as computer controlled anti-knock sensors will compensate by retarding the ignition timing, but doing so will result in both poorer fuel economy and loss of engine power. It can all get rather complicated, I know..
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