All New 2016 Civic

[jut703]

Obviously one Honda's recommended octane rating isn't universally applicable to all other Hondas. So if you want to know what fuel to use for your car, look at your manual. 😊

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[desmosedici]

anyone who uses 95 or 100 octane, when the engine manufacturer says 91, is a fuel manufacturer's better friend.

Using higher RON fuels gives you more anti-knock headroom when conditions aren't ideal - e.g. ambient temps are high, your engine is not tuned optimally, your car is heavily laden and you need to go uphill. Those kind of conditions and a combination of these can cause you engine to knock - regardless of what your manual says. Turbo engines have higher bmep compared to NA, so are more susceptible to knock.

I get the highest RON gas that I can buy because I desire to have more anti knock leeway than usual. I love taking care of my engines.

[desmosedici]

anyone who uses 95 or 100 octane, when the engine manufacturer says 91, is a fuel manufacturer's better friend.

If I understand Janemar's posts correctly, there's an even better reason to go high octane - to maximize your bhp. Based on his posts, the engine management system is allowing the Civic engine to run on lower octane fuels with some clever anti-knock trickery but bhp gains can be had if you run higher octane.

[Janemar]

If I understand Janemar's posts correctly, there's an even better reason to go high octane - to maximize your bhp. Based on his posts, the engine management system is allowing the Civic engine to run on lower octane fuels with some clever anti-knock trickery but bhp gains can be had if you run higher octane.

Good read regarding knock control:
Ignition Timing And Knock Control

Vid demo on knock control learning for the 1.5T civic:
How to speed up knock control learning down ktuner V2 2017 Honda Civic EXT - YouTube

[jut703]

Got curious about the 1.5 Turbo's response to higher octane fuel, and in this thread, Hondata has dyno data showing gains with higher octane fuel:

Premium gas gives 2-3 more horsepower in turbo models (confirmed by Honda rep) | Page 9 | 216+ Honda Civic Forum (1th Gen) - Type R Forum, Si Forum - CivicX.com



The Civic turbo's ECU is designed to run on 87, but will advance ignition timing when it senses higher octane.

The gains were recorded on a manual Civic though. I'm not sure if the CVT's ECU will be as aggressive and if it will translate to higher WHP. Although ultimately, 4-5 hp isn't noticeable for daily use, only on a dyno. Heck, even 2 different cars with the exact same engines and transmissions will have different WHP ratings.

Of course, the Civic RS is an outlier - it's a turbocharged engine after all, and historically turbocharged engines have required higher octane gas. What makes the RS different is that it doesn't knock on 91 RON fuel, while many other turbos will knock on low-octane fuel.

For most other pedestrian NA gas engines (which is about 95% of gas-fed cars in the Philippines), don't expect your car to generate more power from higher octane.

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[StockEngine]

the newer ecus+knock sensors i think do adjust to different fuels. fords ecoboost has the same feature to get maximum output. ford flexfuel.

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[dr. d]

My old honda manual says "Petrol of the recommended RON may not be available in some areas. In this case petrol of a lower octane may be used if it does not cause engine "knocking"."

It goes on to say "Recommended Petrol, 95 RON (min)", then in asterisk, "*unleaded petrol RON of 91 or higher may also be used".

it simply means that engine power is maximized using 95. but the ecu can adjust enough, such that it will also work fine, with no significant ill-effects, on 91.

[dr. d]

If I understand Janemar's posts correctly, there's an even better reason to go high octane - to maximize your bhp. Based on his posts, the engine management system is allowing the Civic engine to run on lower octane fuels with some clever anti-knock trickery but bhp gains can be had if you run higher octane.

if you like driving your car to the limit of the envelope, and your engine can use take advantage of it, then hi octane is for you.
but i drive from point A to point B, just like majority of the motorists out there. 91 octane is fine with me and my engine. it's also cheaper.

you may have your good reason to spend more on 95. i'm happy with the cheaper 91.

to each his own.

[jut703]

if you like driving your car to the limit of the envelope, and your engine can use take advantage of it, then hi octane is for you.
but i drive from point A to point B, just like majority of the motorists out there. 91 octane is fine with me and my engine. it's also cheaper.

you may have your good reason to spend more on 95. i'm happy with the cheaper 91.

to each his own.

For most cars, even if you go for higher octane fuel, the ECU will not recognize and adjust timings for the higher octane, so no additional power.

But for special engines like the turbo Civic, the ECU can adjust for the higher octane, effecitvely adding power. Minimal (~4hp), but it's there. However, even if you feed it 91 octane forever, there won't be any adverse effects because the engine was designed for it anyway.

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[dr. d]

i grew up with a 4 peso a day allowance, kasi.
i still find it discomforting, spending an extra 100 bucks, for 22 liters of fuel.

young 'uns probably will not feel as passionately as me, over a hundred bucks.