Octane Use Poll - Page 4 - 10th Gen Civic Forum
View Poll Results: What octane are you using in your 10th Gen?
87 33 67.35%
89 6 12.24%
91 6 12.24%
93 4 8.16%
Voters: 49. You may not vote on this poll

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post #31 of 33 (permalink) Old 11-02-2016, 09:46 PM
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In our region gas retailers must sell at least 7% ethanol content of all fuel they sell by volume. We can get 91 with zero ethanol, 89 octane with 5 percent ethanol and 87 octane with 10 percent ethanol. That's how they arrive at their 7 percent content, give or take.

Ethanol is a good anti-knock additive in fuel for octane purposes which is fine, but it gives less fuel economy which I don't like. I'd rather have no ethanol in order to get the best fuel economy but I'd have to go up to 91 to get that.

I'm sticking with 89 octane right now, I think the turbo will work well with this fuel , the extra cost doesn't bother me as it will be offset with some fuel economy benefits. If I can run this octane consistently the ecu will probably run more timing advance over the longer term rather than retarding to compensate for lower octane fuel. Just my opinion here.

I get just over 45 mpg's in straight highway driving conditions at 70-72 mph cruising speeds. Not too bad given the cooler temps and the onset of winter gas in our area.

2016 Coupe Touring - Blue
2002 Honda S2000 - Silver with Blue and Black custom interior. Garage Queen.
2015 Jeep daily driver workhorse.

Last edited by JS2000; 11-02-2016 at 09:49 PM.
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post #32 of 33 (permalink) Old 11-03-2016, 05:08 AM
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In Iowa the Ethanol gas is E-10 or 10% ethanol 90% gas.But I live in a state that makes its living on corn production.I filled up on 93 octane ethanol blend last weekend but normally will be using non ethanol 91 octane.I will also have my car tuned for high octane when that option is available.
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post #33 of 33 (permalink) Old 11-03-2016, 01:03 PM
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Posts: 219
yes, your Iowanian gas choices/labeling confused my daughter all last summer. i can't recall how many times i would get a text or phone call...

dad, i'm at the gas station, but this one doesn't have the same numbers as home...which one do i use?

dad, i'm at a different station than last time...it has E numbers...what does that mean?


it went on for 8 months! next summer, we get to do it all over again, this time, out in the bay area of Palo Alto and San Francisco!

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