Quote:
Originally Posted by Timco
I’ve heard this is cleaner and a bit more power, but it’s 88 octane.
Good or bad for P car?
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Not good in either situation. Ethanol is an oxygenator in fuel and is why it is a much cleaner fuel. While ethanol is less energy dense with less power per gallon, the 91 octane will absolutely outperform the 88 octane non-ethanol fuel. 91 octane will allow significantly more ignition advance where the 88 will most likely knock with resulting ignition retard making less power. I believe 93 octane is the min recommended octane but 91 is typically all you can get. I have been mixing 3 gallons 100 octane and 11 gals 91 to get 93 to 94 octane.
As far as water in fuel.......Ethanol fuel has the ability to absorb water which may be desirable during storage since the ethanol can carry water through the system. Water will separate out and form free water in ethanol free fuel and is why it is recommended to have a full tank when using ethanol free fuel during storage, this is to minimize exposed surface area of the tank that can condense water. Pick your poison.