E85 and why you can't just use it
I'm surprised that nobody has talked about the reason you don't run E85 in a car that wasn't designed for it. Yes, you can put it in, tune and run, however ethanol in high concentration is caustic to synthetic plastics, and will compromise the integrity of fuel lines, fuel pumps, and rubber components.
E85 cars from the factory use different fuel system components that will tolerate the higher ethanol percentages.
You can put it in and run it without the E85 conversion, but you will eventually have failures of the fuel system.
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