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26 votes

Wrong octane fuel

It's not a problem mixing them. Just start using 95 if that is what the engine calls for. You'll not create any issues doing so. Modern day engines have sensors which can adjust for the fuel. If ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
21 votes
Accepted

Should I use gasoline 87, 89 or 93 on 2016 RAV4 SE

Realistically, if the manual and the manufacturer are stating you should use 87 octane, that's really what you should use. If you purchase more expensive 89, 91, or 93, you are just wasting money. The ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
19 votes
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Accidentally put regular gas in Infiniti G37

It isn't going to matter in the long run and shouldn't cause you any issues to run the car with the tank of fuel you put in if that's what you decide to do. Cars don't have an octane sensor. What they ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
11 votes

Wrong octane fuel

Presumably since you say "92 octane gas" you are not in Europe. The whole topic is a mess, because there are different scales for measuring "octane". The most common scale world-wide is RON, but ...
alephzero's user avatar
  • 2,944
9 votes

Accidentally put regular gas in Infiniti G37

I had a G35. I believe there was language in the owner's manual that said regular gas would not hurt the engine but you would not get full performance.
Ross Millikan's user avatar
7 votes

Can I use lower octane fuel at high elevation?

You have nothing to lose on a modern engine (except power) Any engine with a knock sensor and computer-controlled ignition timing (e.g. modern fuel-injected designs) should be able to alter ignition ...
Zaid's user avatar
  • 39.1k
7 votes
Accepted

Is it fine to use higher octane gasoline than what is recommended on the fuel cap sticker

It means "at least". You will not cause any damage by using the higher octane fuel. The reason for the RON 95 rating in the first place, this is the lowest octane rating you can run before you might ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

Lexus RX200t octane

If the manual says that 95 octane is suitable then the car will be fine with 95 octane. 98 will only yield appreciable performance gains if the ignition advance is being actively limited by engine ...
Zaid's user avatar
  • 39.1k
6 votes
Accepted

Will 93 octane fuel burn completely in an 87 octane engine?

"Higher octane" only means more knock-resistant. It does not mean "harder-to-ignite" or "hotter burning." A gasoline engine will not perform worse in any way on higher-...
feetwet's user avatar
  • 1,189
5 votes
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How can my car run on 85 octane but be recommended to run on 91?

In current fuel injected vehicles, the computer (ECU) adjusts for it. There are sensors in your engine called "knock sensors". When the sensors start picking up a knock, it will pull timing. Usually, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
Accepted

Lexus RX200t octane

As Zaid said, if the manual says 95, use 95. Simple as that. Actually, using a higher octane rating is not ideal, whatever it may seem. From whatcouldbegreener.com: What will happen if I use ...
anonymous2's user avatar
  • 5,225
5 votes
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Octane number definition differences in different countries

There are different ways to measure the octane number of a fuel. Europe uses the RON method. Research Octane Number (RON) The most common type of octane rating worldwide is the Research Octane Number ...
Hobbes's user avatar
  • 4,412
5 votes

Wrong octane fuel

A modern car (say, post-1995) will run on lower octane gasoline with reduced performance (power, economy) and no other issues. Older cars did a lot of nasty things ranging from occasional "pinging" ...
fraxinus's user avatar
  • 2,062
5 votes

Can I mix RON 97 fuel with RON 95 fuel in my car?

Absolutely you can mix different octanes of petrol (gasoline) in your car, it won't hurt your car and you may get better performance with a more expensive fuel. Premium fuels are generally better ...
GdD's user avatar
  • 16.9k
4 votes

Should I use gasoline 87, 89 or 93 on 2016 RAV4 SE

The acid test is if you try a lower octane fuel, if you hear any "knocking" sounds under hard acceleration (perhaps up a hill), then you definitely need a higher octane rating. As Paulster2 mentions, ...
Mark Stewart's user avatar
4 votes

Can mixing octanes cause the check engine light to come on?

Using a higher octane fuel should not have caused the SES light to turn on. The only fill-up-related thing I can think of which would cause the SES to turn on is if there is a bad batch of fuel (...
Zaid's user avatar
  • 39.1k
3 votes

Does petrol gradually get a higher octane rating with evaporation over time?

Addressing the question from the point of view of a chemist: this sounds highly implausible. Evaporative distillation is not terribly efficient to begin with, even with very different chemicals. I.e....
feetwet's user avatar
  • 1,189
3 votes

Recommended fuel for Honda Fit Sport 2008

Which country do you live in? The gas station should specify whether they are quoting RON or R+M octane. And which market was the car originally sold for? For example: In the U.S., octane is ...
feetwet's user avatar
  • 1,189
3 votes
Accepted

Recommended fuel for Honda Fit Sport 2008

You can take a loot at this Q&A about the octane. For your car, I'd say go with whatever the manufacturer says. They say "87+" then 88 will run fine. There are factors other than the octane rating ...
kyle_engineer's user avatar
3 votes
Accepted

How often does my engine check fuel octane?

The ECU(or at least the better ones) can indeed actively 'search' for the point of pinging as you said. The pinging sensor listens to the combustion, based on that the ECU determines how close it is ...
Bart's user avatar
  • 2,954
2 votes

How much can sub-optimal octane affect efficiency or power?

It's obviously not like: 10% lower octane is 10% less timing advance, 10% less power, and 10% more fuel consumption. I don't think it's even possible to calculate beforehand how much you will benefit ...
Bart's user avatar
  • 2,954
2 votes

How much can sub-optimal octane affect efficiency or power?

I can't tell about precise numbers, but have some experience with my cars and multiple gas types usage: if a lower octane is used in an engine tuned for higher octanes, the engine looses power a lot. ...
Aram Alvarez's user avatar
  • 3,346
2 votes
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Changing spark timing to use a lower octane fuel?

Could the increase in the electrode gap in the spark plug cause wear on the ignition coil/charge distributor? Increasing the gap on spark plugs does cause wear on the all the parts you mention. I ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

Changing spark timing to use a lower octane fuel?

I am not sure about increasing the electrode gap but the rest I can answer. Retarding the timing should not cause any damage to the internals of the engine. it is basically making the spark happen ...
Cc Dd's user avatar
  • 2,879
2 votes
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Can mixing octanes cause the check engine light to come on?

Mixing octanes in an upward-direction is fine. But, not completely tightening the gas cap could cause that. If you want to know exactly why the CEL came on, just take the vehicle to a retail car-...
Cognitive Hazard's user avatar
2 votes

Difference between high octane and low octane?

Here's the deal : higher octane means less volatility, and this is meant for engines with higher compression so that the fuel doesn't ignite too early in the cycle . Lower octane fuel is more ...
Joel Knafo's user avatar
2 votes

85 octane gas causing engine knocking and retarded CAM time?

Adding to tlhIngan's answer: You can mix fuels of different octanes (actually, it's not unusual for a gas station to have a blend valve to get the mid level octane fuel to eliminate the need for ...
Jason C's user avatar
  • 4,890
2 votes

85 octane gas causing engine knocking and retarded CAM time?

Two things: Running fuel with a lower octane rating than what your engine needs will cause "knocking" (premature detonation). Colorado has fuel with a lower octane rating because higher altitude ...
tlhIngan's user avatar
  • 12.2k
2 votes

Fuel Type (octane) for Mazda Axela 2010

Don't trust the dealer. Instead, read your owner's manual and do keep in mind the different octane rating schemes pointed out by Paulster. If you don't have an owner's manual, see if this one has your ...
tlhIngan's user avatar
  • 12.2k
2 votes
Accepted

Fuel Type (octane) for Mazda Axela 2010

According to what I'm reading, the Axela is another name for the Mazda-3 we have here in the states. There are two engines offered for the vehicle: 2.0L & 2.5L. Both engines only require "regular ...
Pᴀᴜʟsᴛᴇʀ2's user avatar

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