What gas octane do you use in a 2019 honda civic touring 1.5 turbo?

905Civic · Apr 1, 2019

I use 91 Octane w/ Ktuner and knock control is fine. Might bump to 93 in the summer when the weather is hot, but I'll monitor it (especially with this damn carbon tax that was implemented today)

cruisencode · Apr 1, 2019

aeonixx said:
If you are running any turbo you should be running at least 91.

Not according my my Civic's owner's manual. It clearly states 87 octane for my '17 hatch. That being said, I always put in 91 with my tune. :headbang:

HexSosa1 · Apr 1, 2019

Maybe if your tuned I see running a higher octane gas but I run 87 octane and there is plenty reasons why you can run higher but in reality its all the same difference.

Gruber · Apr 1, 2019

gtman said:
That's pretty much all it is. Along with the slightly freer flowing exhaust. Hondata actually mentioned this a long time ago. Someone here said the Sport has a different ECU tune, but as far as I know, it's identical to the non-Sport tune.

I don't think so. The nominal power should refer to any allowed octane, not only the recommended.
DYno measurements show a bit more on premium fuel, like here, where they use it to advertise their "special" fuel.

https://www.civicx.com/threads/dyno-1-5-turbo-stock-euro.32712/

I have no proof, but I believe the tune is a bit different and why shouldn't it be, with different exhaust? Both intake and exhaust differences would call for tuning the tune. It may also be slightly different just because it is supposed to be "sport".

Gruber · Apr 1, 2019

civicls said:
Data backup please? What does a higher octane fuel do?

The higher the octane number the higher the pressure that the mixture can be compressed without detonation. So high octane makes it possible to buid engines with higher cylinder compression ratios, which means more power.
In forced induction engines the initial pressure is higher, so after compression the mixture will also be higher compared to a N/A cylinder with the same compression ratio.
So, the effect of forced induction is higher pressure during the compression stroke, just the same as the effect of a high compression ratio.

The result is that a turbo or supercharged engine will be always closer to knock, the more you are mushing that pedal, the closer. That doesn't mean that all forced induction engines require premium, because there are many tricks, besides timing, that reduce the tendency to knock. But retarding timing reduces power. A high compression ratio and turbo engine would tend to require premium fuel and would squeeze the most power out of any given displacement.

This is really elementary, no "data" needed.

All of the above being true, I'm not advocating for using premium fuel if the manufacturer doesn't mention anything about it. But I would probably still tend to pour higher octane on the days I was going to particularly torture my turbo engine.

hfpdohc · Apr 1, 2019

Neoxon said:
It also 3.50 here in Florida. I agree that the 91 octane is needed for the 180 horse power for the sport hatch and that is how they got that number (also why they recommend it). You can start using gasbuddy and she'll fuel rewards to start saving money. I had a deal for gasbuddy which was .20 cent/gallon so that easily 2$ saved plus fuel rewards .05/gallons. I am getting the gasbudy card to hopefully use both at the same time. You should also start using fuely to track each fill up. I averaged around 43.5 mpg with 90% 65mph driving on back road (not highway) with 200 miles.

man your gas is cheap as fawk...here in canada its 4.90 $........stop whining...lol
i still use premium 91

hfpdohc · Apr 1, 2019

cruisencode said:
Not according my my Civic's owner's manual. It clearly states 87 octane for my '17 hatch. That being said, I always put in 91 with my tune.

i had the same model as your...and its not for nothing that they put regular OR HIGHER.......car ran way smoothly and those 6hp more were there trust me on stock

civicls · Apr 1, 2019

Gruber said:
The higher the octane number the higher the pressure that the mixture can be compressed without detonation. So high octane makes it possible to buid engines with higher cylinder compression ratios, which means more power.
In forced induction engines the initial pressure is higher, so after compression the mixture will also be higher compared to a N/A cylinder with the same compression ratio.
So, the effect of forced induction is higher pressure during the compression stroke, just the same as the effect of a high compression ratio.

The result is that a turbo or supercharged engine will be always closer to knock, the more you are mushing that pedal, the closer. That doesn't mean that all forced induction engines require premium, because there are many tricks, besides timing, that reduce the tendency to knock. But retarding timing reduces power. A high compression ratio and turbo engine would tend to require premium fuel and would squeeze the most power out of any given displacement.

This is really elementary, no "data" needed.

All of the above being true, I'm not advocating for using premium fuel if the manufacturer doesn't mention anything about it. But I would probably still tend to pour higher octane on the days I was going to particularly torture my turbo engine.

That wasn't my point, I was telling him not asking

IronFusion · Apr 1, 2019

95 LEADED or bust.

.....just check the calendar before acting

KYBubblehead · Apr 1, 2019

TypeSiR said:
Thanks for the suggestion. I use Costco card that gives 4% discount on top of slightly lower gas prices. I’ve yet to crack 40mpg in LA traffic. Getting around 36mpg in mixed driving.

I also use COSTCO gas (93 octane) The manual recommends 91 octane and COSTCO is the least expensive.

BriteBlue · Apr 1, 2019

aeonixx said:
FIrst of all 87 is Ok and WalMart is OK. If you are running any turbo you should be running at least 91. Running 91 will fire quicker and burn more completely. You are literally destroying your motor slowly by running lower octane fuels. For a few cents more you are running mfg suggested fuel/ Read this article and decide. http://www.whatcouldbegreener.com/142/fuel-octane-choosing-the-wrong-octane-will-cost-you/

Just like it says "Use only what the owner’s manual specifies." and "you will be wasting a huge amount of money paying for high octane gasoline."

So why should I run 91 octane?

midengine driver · Apr 1, 2019

Shell Premium, nothing but! Pedal to the Medal! Sport Hatch. Known fact, engine has spark knock sensors, and RETARDs timing. So higher octane has less spark knock, thus Less RETARDation!

CVTsport18 · Apr 1, 2019

91 is recommended for the Sport so it's what I use. Filled up today, $2.90 a gallon at Sinclair. I really don't think it matters, unless you're tuned. I just don't want any lip from the dealership should any engine or fuel issues make an appearance.

brienp · Apr 1, 2019

Im just commenting so I can get notification of all the people, who have zero concept of how compression relates to octane rating, feeling the need to spread their uninformed opinion as God's word. Carry on.

What gas octane do you use in a 2019 honda civic touring 1.5 turbo?

905Civic

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cruisencode

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HexSosa1

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Gruber

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hfpdohc

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