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The burden of proof is on people claiming that the fuel system will degrade at the same rate with E85 as with E10. That's a huge assumption right there. The people loudly claiming that E85 will have no long term effects are the people who have financial interest in that statement. What are you going to claim next, that leaning out the fuel with a performance tune won't degrade the cat? I'm not saying that cat life is or should be a high priority, but it's the same kind of statement--durability claims with insufficient data.
You use E85 with the stock fuel system at your own risk. It could cause problems in a year, or 10 years from now, or never. It's totally up in the air. We have no idea what the suppliers did for durability testing on E85 with the injectors or the pump.
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