I watched videos about the octane number on multiple channels and yours was the most revealing one, thank you for information.

Modern engine with knocking sensors and all sorts of other sensors can benefit from higher octane fuel with mostly advanced ignition timing.

I just bought a new Camry and I can’t put 87 octane on it. It causes knocking on the engine. I now put 92 octane from sams club and it is gone. I might have been able to get away with it at 89 octane but want to play it safe since I only pay 2.79 for my 92 octane.

So if the fuel has a higher octane rating, how does that affect to the energy produced by the ignition? Does it even affect it at all? I came here from a Koenigsegg Jesko video and thought it was weird how 100+ octane fuel increased it’s horsepower by 400, so I would LOVE to see something about that. Still, this video taught me something new and I thank you for it.

Great video. Definitely deserves many more likes and views.

Best explanation..!!!

I’m not usually “that guy”, but I need to draw a correction to your attention: Modern cars will get better fuel economy with a higher octane rating fuel. Let me explain why. Modern engine control modules (c. 2014) use a very complex stream of data to continually attempt to advance the ignition timing as much as possible with the goal of producing as much power from the available fuel/air mixture as possible. The ECM is receiving data from the EVAP system telling it what hydrocarbons, as well as ethanol percentage etc are in the fuel. Timing feedback is limited the most by knock sensors and vibration sensors designed to detect any pre ignition and adjust the ignition timing accordingly. Thus I submit to you that higher octane rated, more stable fuel will allow for more advanced ignition timing before pre ignition and knocking; which allows for more power to be produced with the same fuel. So it follows that a driver would not need to open the throttle as far to achieve the same result in available power. Additionally you can conclude that obtaining the same power from an engine with the throttle closed farther, is indeed more efficient than opening the throttle and burning more fuel with later (retarded) ignition timing. Thanks for thinking about this!; if you’ve read this far, you’ve given it much more thought than most folks already! Cheers!

Here in Malaysia fuel prices are RM2.05 per liter for RON95 petrol which is about USD1.67 per gallon for "Mid-grade" gasoline. The prices are fixed throughout the entire country and it mostly comes from imported sour crude oil. It's interesting seeing people talk about how expensive fuel is in the US and how dufferent the prices are.

Most beautiful explaination

So just to be clear: 1. Is higher octane rating is lower it’s harder for the combustion to continue without more compression and input energy? 2.Do high performance cars produce more compression for each stroke of the piston? I presume this is either horse power or torque and how are those two words related to compression of the gasoline? 3. Why not just load up a ton of pistons to make a ton of power? As in how do they balance the cost/power efficiently ratio of making an engine more powerful vs cost efficiency?

Does octane degrade if left in for a few months, that is if I purchase 87 octane and leave it in a fuel tank for a month does it slowly go down to 86, 85, 84 octane etc.

great explaination. cheers bud

What runs on 87? In europe the minimum is 95

Awesome video! Thank you!

Read your owners manual, use the octane rating that it says.

Than why do I get 5 more mpg with 93 versus 87? I thought you said they're the same?

Thanks for the information

So exmark mowers I should use 93?

Great thanks easily understood :-)

What about ethanol? Wouldn't that be a reason to purchase a higher grade, to avoid it?

I heard 1944 spitfires sometimes used a 150 octanes fuel... Is that even possible ?

Help me on this. I have a Hyundai i30 1400cc turbo gdi with 140ps, 2020 model. Do i need premium gas or not?

Do GDI engines require a higher octane? I have a Hyundai Sonata 2.4L with 11.3 to 1 compression.

good video!

I think I have read somewhere about an octane number above 100. Could it be possible? If yes how is it or what does it mean? Clearly if the octane number indicates percentage it cant go above 100 Since I knew it's the percentage of octane I cant understand what 102 octane could mean

I had a 99 Dakota that did not like the cheap shit. rattled bad, the dodge mechanic said to run higher octane gas and it never did it again.

can we do something with this? like this has potential for clean energy and we need

Very well explain.

thx so much!

could you tell me if an average fill with higher octane fuel,what will happen?

It’s not sold like that in TX and we’re the petroleum state

Could you enlighten us on how you can have an octane rating above 100%?

Is mid grade OK for a 4 cylinder turbo car?

17,273 views and not a single dislike. Is this a KZfaq record?

So like... wtf

In the Dominican Republic, we get gasoline with an octane rating in the high 70`s and low 80`s. the government allows it to be presented as premium gas even though is complete shit. that's how living in a third-world country is like.

Hi

What if I just want to put 91 octane in my 15 year old truck to make me feel like a race car driver?

87 octane

The Motor octane is more relevant to modern automobiles.

Chemistry aside, Octane is an actually good name for once instead of "Rutherfordium"

Wow. 87? Mine works just fine with 85. And the highest I've ever seen is 91

WAAAAY over-simplified, but that's more than the average u-toober can understand anyway...If you drive a turboed car, the pump "rating" on octane is meaningless. And the Research and Motor methods of testing gasoline haven't been tested at 600 and 900 RPM's since 1933. Read the API or SAE testing methodology. You can get both at any library...

Ok that 3 minutes did not help at all lolol

87 octane