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I understand that E85 is just fancy corn booze, what I dont understand is how you can simply add it to the same tank of conventional gas and have a fuel and ignition map run optimally. Is there a sensor that can gauge how much ethanol content in the fuel at any given time and adjust the maps accordingly? Or, is it like an on/off type deal switching from E85 map to conventional premium gas map?
From what I understand is that if you have residual conventional petrol in the tank then you fill up with E85, the fuel will mix and you end up with something closer to a E70 gas than a E85. What has to be done to the car to compensate for this?
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