Are higher-octane gasolines always better than lower ones?

[oj88]

I've read that older engines may stand to benefit from high-octane fuel. (Busting the Octane myth about gasoline. | Yec Headquarters 6 Day Creation)

At the end of the day you, the driver, is the one spending for gas and has the final say on things. If you think that high-octane gas makes your engine purr like a kitten than it does on regular gas (and you're sure that it's not just in your head), by all means, high-octane is for you. You'll be sure that the smoother the engine runs, there should be less wear.

Just remember that higher-octane fuel is relatively much safer for any car engine compared to regular gas as far as engine wear is concerned.

[nivraarvin]

Mahirap kasi sensory observation. Try to measure your FC with petron extra and petron blaze. At least you'll have data to back up what you felt while driving with each fuel.

I compared PTT and Seaoil diesel (yes, I know na gasoline yung topic pero this is what i have as an example).

PTT - Consistent 10.22+km/l

Tried Seaoil - 8.22km/l

Went back to PTT - 10.2+km/l ulit

Tried seaoil again 8.15km/l, nag expressway pa ko niyan.

Because of the results, Im staying away from seaoil diesel for now.

[vinj]

Mahirap kasi sensory observation. Try to measure your FC with petron extra and petron blaze. At least you'll have data to back up what you felt while driving with each fuel.

I compared PTT and Seaoil diesel (yes, I know na gasoline yung topic pero this is what i have as an example).

PTT - Consistent 10.22+km/l

Tried Seaoil - 8.22km/l

Went back to PTT - 10.2+km/l ulit

Tried seaoil again 8.15km/l, nag expressway pa ko niyan.

Because of the results, Im staying away from seaoil diesel for now.

I observed that some car brands/engines prefer a certain octane rating or brand over another (i guess because of the additives). This is quite evident on my old Sentra which runs on a carburetor engine; it prefers 95 octane over 93 (has better power as we run the car on a lighter gas pedal foot), then on the brand she seems to idle more smoothly with Total 95 octane. I'd suggest you try several brands and octane levels and observe your fuel consumption and performance.

[Walter]

If one uses a lower octane fuel than what the engine requires, the engine is supposed to knock. But since modern engines have knock sensors installed, it won't knock. What happens is that the engine adjusts to avoid knocking but performance is affected. So when one uses the correct or higher octane fuel rated for the engine, people feel the improved performance. But that's how the engine is supposed to perform in the first place before it was fed with a lower octane fuel.

[oj88]

^ You shouldn't use lower octane than what the car manufacturer recommends. The ECU can only react to bad fuel up to a certain point and will not be able to protect the engine when it goes beyond its programmed threshold.

[[archie]]

If one uses a lower octane fuel than what the engine requires, the engine is supposed to knock. But since modern engines have knock sensors installed, it won't knock. What happens is that the engine adjusts to avoid knocking but performance is affected. So when one uses the correct or higher octane fuel rated for the engine, people feel the improved performance. But that's how the engine is supposed to perform in the first place before it was fed with a lower octane fuel.

I've been using fuel save with 91 Ron ever since I got the crv gen1. No problems what so ever.

[3GEMS]

For me w/ higher octane hindi lang placebo effect makukuha. Based on my observation kapag gamit ko 91 rating lakas vibration ng makina ramdam mo during idle. And terms on power mararamdaman mo din...
Fofi 1.4at user here...

And proven na to by Discovery turbo using subaru impreza ata..

Sent from my HTC Desire V using Tapatalk 4

[[archie]]

For me w/ higher octane hindi lang placebo effect makukuha. Based on my observation kapag gamit ko 91 rating lakas vibration ng makina ramdam mo during idle. And terms on power mararamdaman mo din...
Fofi 1.4at user here...

And proven na to by Discovery turbo using subaru impreza ata..

Sent from my HTC Desire V using Tapatalk 4

Yes proven with performance cars like the impreza. There were significant hp gains but maybe you left out the part that they tested it on Econo cars. No significant hp gains, if I remember it right around 1 or 2 hp gains... Which I highly doubt anyone could feel in a blind test.

[jhnkvn]

Sympre with performance cars, iba na talaga. That's why we have race fuels with octanes of 105 and even higher. Problem is it's unprofitable to import race fuel thanks to our absurdly low penetration rate for performance cars. I'm talking about the likes of 1000+ HP fully-modded R34s or Lamborghinis.

I've studied the market and even if you put a station in our race tracks in Batangas and Clark and prestigious areas such as Fort Bonifacio, Ayala Alabang, Forbes Park, and other prestigious villages.. nasa red ka pa rin. Remember.. performance cars. As in real ones. Not the sight of your FWD Civic, Lancer, Altis, <insert most vehicles here> with a few performance parts and a fat-ass rear spoiler for reverse downforce. You're better off importing jet fuel for our airline use

[oj88]

Sympre with performance cars, iba na talaga. That's why we have race fuels with octanes of 105 and even higher. Problem is it's unprofitable to import race fuel thanks to our absurdly low penetration rate for performance cars. I'm talking about the likes of 1000+ HP fully-modded R34s or Lamborghinis.

I've studied the market and even if you put a station in our race tracks in Batangas and Clark and prestigious areas such as Fort Bonifacio, Ayala Alabang, Forbes Park, and other prestigious villages.. nasa red ka pa rin. Remember.. performance cars. As in real ones. Not the sight of your FWD Civic, Lancer, Altis, <insert most vehicles here> with a few performance parts and a fat-ass rear spoiler for reverse downforce. You're better off importing jet fuel for our airline use

Well, if you slap in a turbo, it will artificially increase the compression ratio that could be high enough to cause pre-detonation. In which case, using a higher octane fuel may become necessary.

Btw, "reverse downforce" is lift.

[jhnkvn]

Well, if you slap in a turbo, it will artificially increase the compression ratio that could be high enough to cause pre-detonation. In which case, using a higher octane fuel may become necessary.

Btw, "reverse downforce" is lift.

Yes yes.. I know about the reverse downforce masaya lang i-type since I usually joke around saying "Reverse downforce YOOOO" in the tune of "VTEC just kicked in, yo!" whenever I see a massive spoiler on FWD vehicle.

[brainmafia_310]

Makikishare lang rin mga sir. Octane rating alone cannot increase the energy content of the fuel pero to increase the octane the additives or whatever they are adding have a lot to do here ang effect higher octane with higher energy content.

I also do not believe that higher octane gas can save you fuel, i use the fuel who can give me a better fc. Sa extreme97 taas fc ko like around 450km 1ft or around 14kpl. Pero sa phoenix98 bagsak fc ko around 380km 1ft around 11kpl lang. Sa unleaded ng shell, phoenix at total same fc ako around 12.5kpl. Sa petron unleaded sama fc ko sumabit ng konti sa 10kpl. Havent tried xcs and blaze and shel nitro plus. Mahal eh.

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[siopaonatoasted]

SA V-Power nitro, di lang naman octane boosted yung fuel, nitrogen boosted yun.

[jut703]

SA V-Power nitro, di lang naman octane boosted yung fuel, nitrogen boosted yun.

Bro, walang nitro ang V-Power Nitro+. It just uses a different base fuel from FuelSave and also has better additives (specifically Shell's Fricition Modifier Technology). The focus during the development of Nitro+ was for a cleaner burn and less deposits in your engine.

[siopaonatoasted]

The Fuel Journey
.

In modern engines, like direct injection and turbo-charged, fuel injectors

In conventional engines, the unique, patented Shell Nitrogen Enriched Cleaning System cleans and protects intake valves and fuel injectors, so the engine can perform at its best.

In modern engines, like direct injection and turbo-charged, fuel injectors are subject to greater heat and pressure, which can cause a breakdown of cleaning agents.

The Shell Nitrogen Enriched Cleaning System is designed to maintain thermal stability and work under extremely hot engine temperatures, actively protecting against performance-robbing gunk.

http://www.shell.us/products-service...ls/inform.html

I did not say that there is a nitro as in NOx.

[nivraarvin]

Makikishare lang rin mga sir. Octane rating alone cannot increase the energy content of the fuel...

You can compute the heat of combustion of iso-octane and n-heptane. It is simple energy balance.

Iso-octane C8H18
N-heptane C7H16

Octane Number = Iso-octane %

Again, weather your engine is capable of extracting that and converting that to noticeable power gain is another question. But the iso-octane/n-heptane composition determines the energy content per volume/mass of fuel.

If others are still not convinced, you can consult stoichiometry books.

I personally don't use petron blaze, why? Peso/kilometer is higher compared to regular fuels.