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Join Date: Oct 2018
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Gasoline octane question

Hi.
I have an 87 944 turbo and just wanted some opinions on gas octane.i found a local gas station that has ethanol free 90 octane, I have been running 93 with ethanol. So my question is what is better 90 without ethanol or 93 with
Thanks cory
Old 11-30-2018, 11:39 AM
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93 octane has higher knock-resistance/higher AKI
Ethanol blend will give lower MPG
Ethanol may harm plastic components of fuel-system, depends upon concentration

90-octane has less knock-resistance/lower AKI
Will get more MPG

Last edited by DannoXYZ; 11-30-2018 at 05:32 PM..
Old 11-30-2018, 05:28 PM
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Quote:
Originally Posted by DannoXYZ View Post
93 octane has higher knock-resistance/higher AKI
Ethanol blend will give lower MPG
Ethanol may harm plastic components of fuel-system, depends upon concentration

90-octane has less knock-resistance/lower AKI
Will get more MPG
+1; there is anti-knock sensor in play: its purpose is to keep pistons/rings/spark plugs in one piece. Without going into specifics, there are a number of ways to deal with today's gasoline 'problems': none really good, cost efficient and/or easy.

I have a station that serves up 'no-corn' 93 (and I consider myself very lucky): it's expensive and 15 miles away from home but still I make the trip to fill both our 68 912 (engine built to CR 9.0:1) and 86 951 (chipped). If you are going to use an ethanol-blend, I recommend using a gas treatment (BG Ethanol Defender or the like) but that will still not protect fuel system components from ethanol. It is also important to keep ethanol-blended gas moving through the fuel system (frequent driving/refilling tank) to prevent phase separation and damage that water will cause.

Peter

Last edited by Peter Graham; 12-01-2018 at 03:25 AM.. Reason: punctuation
Old 12-01-2018, 03:23 AM
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Another good product to prevent ethanol phase-separation is Sta-bil 360.
For long-term storage in winter, especially on my carbureted motorcycles, is Sta-bil 360 Marine with higher concentration.
Old 12-03-2018, 09:06 PM
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Thanks you!
Old 12-03-2018, 10:00 PM
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