Some bad information in here. Just figure I would clear a few things up. E85 is perfectly fine with the stock lines. It will not degrade the small amount of rubber at all.
You WILL gain with E85. Even if it is only a few HP, the safety margin alone and not being on the verge of detonation is worth it IMO. It was the first mod I did to my car.
With these newer High Compression motors, high octane and good fuel is essential for longevity! Especially once tuned and pushing more timing than the factory has designed it for. E85 is a safeguard against detonation. No #8 failures here!
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