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Old 10-02-2004, 01:47 PM
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Some decrease in mileage can be expected unless you jack up the compression and take advantage of the higher octane rating.

More cylinder pressure will raise the engines efficiency up to help compensate for the lower energy released from the E85. It won't offset the entire loss but it would help.

I can see no reason why an engine couldn't be built to take full advantage of the fuels higher knock resistance and be just as efficient as a gas burning engine.

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