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Besides increased compression ratio and perhaps simpler emissions equipment what else is there to do? The only difference between flexfuel and not is the fuel system withstands degradation from ethanol better and the ECU has programming to give more fuel. Everything works the same way, except ethanol burns a little differently and has more charge cooling effect. Raised compression and direct injection together would see some sort of improvement to fuel efficiency, but it'll still be small. You will still have to fill up more often if they don't make the tank bigger :P
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