Octane Use Poll - 10th Gen Civic Forum
View Poll Results: What octane are you using in your 10th Gen?
87 31 67.39%
89 5 10.87%
91 6 13.04%
93 4 8.70%
Voters: 46. You may not vote on this poll

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post #1 of 33 (permalink) Old 04-13-2016, 09:56 PM Thread Starter
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Octane Use Poll

A poll to see what octane folks are using. Post comments on any mpg or performance changes you've seen. I know break-in mileage will be a factor.

2013 CBP EX-L sedan w/Navi.: K&N Drop In
33,333 Mi.;Avg MPG:33 city;44 hiway;87 E10;ECON On
46 mos. old, not a single problem, issue, or recall.
I've gone out to find myself. If I return before I get back, have me wait for me.
87,956 more Civics than Cruzen in '13
52,921 more Civics than Cruzen in '14
108,782 more Civics than Cruzen, in'15
145,771 September '16 YTD
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post #2 of 33 (permalink) Old 04-13-2016, 11:59 PM
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People who live in high altitude regions, e.g., Colorado, may be running less than 87 since less than 87 is routinely sold as Regular. For most older, dumber, cars, the car would never know or care about running 85 in place of 87 in Denver. There's some question whether this is still true. Honda is silent in the OM. Ford, in the manual for our former '12 Focus, explicitly said to use at least 87 even in high altitude areas where lower octane is sold as Regular.
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post #3 of 33 (permalink) Old 04-14-2016, 08:48 AM
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87-89 is fine for the Civic and I don't think you really need to go any higher than that. The average four cylinder car won't really see the advantage with premium gas.
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post #4 of 33 (permalink) Old 04-14-2016, 08:58 AM
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No need or benefit to running higher Octane Rating than what manufacturer recommends. It's just money down the drain.
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post #5 of 33 (permalink) Old 04-14-2016, 09:19 AM
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From what i have also understood using the recommended grade of gas is what you should use, anything more and you're wasting money. One video that might help to understand this a bit is this here:

If what you're currently using is working well, stick to it.

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post #6 of 33 (permalink) Old 04-14-2016, 02:34 PM Thread Starter
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I posed the question (and the poll) to see if the new 1.5L turbo motor is octane sensitive. The r18a motor in my '13 EX-L is oblivious to octane after an extended test with 93 E10. I am wondering if this is going to be true with the new engine in the Civic. My curiosity comes from watching the 1.4L turbo motor in the first generation Cruze. That motor was horribly sensitive to octane rating. The Cruze OM said 87 E10 was the requisite fuel, but the engine had several issues with it in high altitudes, heat, and loading. It would heat soak easily, have to turn off the A/C in the heat, and would pull timing so much that acceleration was nearly dangerous. 91 E10 would fix the problems, or you could spend $600 for an aftermarket tune. I'm watching to see (make sure) the new Civic doesn't have those sorts of issues before I consider purchase of one.

2013 CBP EX-L sedan w/Navi.: K&N Drop In
33,333 Mi.;Avg MPG:33 city;44 hiway;87 E10;ECON On
46 mos. old, not a single problem, issue, or recall.
I've gone out to find myself. If I return before I get back, have me wait for me.
87,956 more Civics than Cruzen in '13
52,921 more Civics than Cruzen in '14
108,782 more Civics than Cruzen, in'15
145,771 September '16 YTD
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post #7 of 33 (permalink) Old 04-14-2016, 09:40 PM
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I have only used 87 for 4500 miles now. Runs great
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post #8 of 33 (permalink) Old 04-15-2016, 06:49 PM
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The ECU controls everything, and it is calibrated for a certain octane, which of course is the octane recommended in the manual.
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post #9 of 33 (permalink) Old 04-16-2016, 08:18 PM
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Not sure how the octane level would affect the engine at high altitudes, heat, etc but I assume HOnda took everything into account when testing the new civic so it wouldn't run into these problems.
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post #10 of 33 (permalink) Old 04-17-2016, 06:01 PM
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Quote:
Originally Posted by 4Tires View Post
Not sure how the octane level would affect the engine at high altitudes, heat, etc but I assume HOnda took everything into account when testing the new civic so it wouldn't run into these problems.
Yes sir, all that is part of the calibration process. I used to help build the ECU's for Honda... they take no shortcuts in engineering.
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