[Northern Nick]

Ethanol has less energy than petrol, so it makes you go slower and get worse MPG.

Ethanol is hygroscopic so it sucks moisture out of the air and mixes that moisture into your fuel

not corrosive so your engine won’t dissolve but alcohol based fuels should be reserved for race cars who can make use of the properties they can offer. Cars designedto take advantage of ethanol love the stuff but for our normal, boring, run-of-the-mill civics it offers no benefit whatsoever.

phase separation before filling the tank should be the attainable dream that everyone with a car is pushing themselves toward

 

[Northern Nick]

BS:EN 228 is the standard for fuel in the UK, we have had up to 5% ethanol since 1992.

Nitrile and Viton and are the most commonly used polymers in automotive fuel systems, specifically because they are not soluble in organic hydrocarbons or alcohols.

Point remains, if you really care you’ll. phase separate the ethanol out of your fuel for higher energy density fuel.
Chemistry still tells us that despite higher latent heat of evaporation you still get fewer mpg and fewer bhp without a flex fuel sensor and appropriate mapping which our cars do not have.

Nothing more to say in this thread, I’m out.