Ethanol is an aliphatic organic compound. Dino fuel used to be nearly all aromatic. Differences between these types of compounds is basically the benzene ring (aromatics) and straight, or branched chain (aliphatics). Aliphatics will often mix with/dissolve in water and aromatics mostly not.
That also means they dissolve different solids to different degrees. The old rings and pipes were made in materials of the day which were resistant to the fuels of the day. That is now not the case when using bio fuels. Hence the possible problems.
Note I said possible. The older the machine parts the more probable parts may be attacked/degraded. Warnings come in 'cover yourself against any litigation' these days.
One of the differences is that ethanol will hold water in the fuel and so may cause more corrosion of mild steel. Others are plastic tanks for dino may be slowly attacked by bio, energy density is different (so fuel metering may be compromised), volatility and combustion rates are different. Etc etc.
Maybe all small things but any one of them might be just too much in any individual situation.
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