[Big Carl]

Im lucky enough to live in an area where I can buy both 93 octane and ethanol free fuel...just not at the same time.

 

Given the choice, would you rather have 93 oct R+M/2 10% ethanol, or 91 oct ethanol free?

 

My car is a weekend fun car and occasional autocrosser that doesnt come out to play in the rain or snow.

It can sit for a few weeks at time between drives and is stored indoors from Nov to April.

 

I like the thought of more ignition advance with the 93, but  I know ethanol has problems with phase separation and water contamination. I'm thinking I probably pay for 93 but in a few weeks its turning to 91 in my tank regardless.

 

Any experts care to chime in?

 

Thanks

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[Krister]

I wouldn't worry about 10% ethanol. Problems with ethanol is when it's the opposite. 90% ethanol, 10% gasoline. Maybe for winter storage I would fill with pure gasoline.

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