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1. ethanol is harsher on rubber gas lines.
2. Ethanol is more prone to explosive issues
3. some groups are claiming e85 takes more to farm and convert in diesel then it actually produces. I find this unlikely, but can anyone offer some real evidence one way or the other?
E85 vehicles mitigate these issues with different gas lines (poly?) and fuel pumps with spark arrestors built in. In order to take full advantage of e85 based fuel the vehicles engine should have sufficient compression.
That said, i think the likliehood of a catastrophic failure is ultimately very low, and I suspect engine performance would drop off so significantly to most folks they wouldn't ever push this high of a ratio in. Most fuels in my neck of the woods have a high (15% or less) amount of ethanol in the regular petroleum anyway.
A couple additions, on the pro side. I have heard that ethanol "burns cleaner" and will leave less carbon deposit in the engine, any truth?
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