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One thing I don't get about flex fuel vehicles is how you can make an engine that will run on either E85 or gasoline. It would seem to necessitate huge compromises. If you wanted to build an engine to run just E85 you would want the compression to be something like 12:1-13:1 as I understand it. But of course even 93 octane would not work in such an engine. There is only so much you can do by retarding timing. If you leave the compression down in gasoline territory (9:1-10:1 for 87 octane) than running E85 in it would just be a waste. I've been trying to find more info on the tradeoffs used to make a flex fuel engine, anyone have any good links?
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