What type of octane I should use??? - Toyota Yaris Forums

krakkhenz · 02-14-2006, 10:18 AM

Im a little confused about this, my car seller told me that I should use 95 octane gas, but the manual says I should use 91

What are the difference between 91 and 95???

My yaris got a 1.3 engine.

why? · 02-14-2006, 11:22 AM

I'd go with what the manual says.

The difference between octanes is how much pressure is required to ignite the fuel. The higher the rating the harder it is to ignite the fuel.

GabL · 02-15-2006, 09:11 AM

I thought the car (Yaris) can run on 87?

why? · 02-15-2006, 10:34 AM

Quote:

Originally Posted by GabL

I thought the car (Yaris) can run on 87?

The rest of the world measures octane differently then we do in North America.

GabL · 02-15-2006, 04:55 PM

oh, didn't saw the OP was from Panama...

as400g33k · 02-15-2006, 08:15 PM

the yaris is rated to run at 91 but can also accept higher octane. most people would claim a performance boost when using higher octane. while some would even claim better fuel efficiency with higher octane.

we use 91, as it is cheaper than 95, 98 or 100 octane. :)

GabL · 02-15-2006, 09:52 PM

Quote:

Originally Posted by as400g33k

the yaris is rated to run at 91 but can also accept higher octane. most people would claim a performance boost when using higher octane. while some would even claim better fuel efficiency with higher octane.

we use 91, as it is cheaper than 95, 98 or 100 octane. :)

100 octane!! It's gonna burn like

swng · 02-15-2006, 11:09 PM

Don't worry friend, the higher is the octane no., the harder it is for the fuel to burn

.

GabL · 02-16-2006, 08:19 AM

Use what is recommanded in your user manual...

http://autorepair.about.com/od/engin...hoctanegas.htm

why? · 02-16-2006, 10:18 AM

Quote:

Originally Posted by ToTo

Hi guys! So the harder for the fuel to burn is not good in the long run? I have a TS model, I currently use 95 octane... What if I were to use 98 or 100 octane fuel, what would change? Would the car run better or would I feel a bit more power or torque, or is all this just BS?

Unless you are experiencing rough running or misfires, then odds are the car would not run smoother.

However there prolly would be a slight increase in tourque and fuel mileage with higher octane fuel.

With fuel that is harder to burn, the spark timing can be set better, and the detonation can be more exact. This also means that the computer can use a more exact air/fuel ratio.

The thing is if your vehicle is stock, it might not make a difference that you could actually feel in everyday driving. The only way you could tell is by using a dyno, and that gets really expensive.

krakkhenz · 02-16-2006, 11:27 AM

ummm... thanx for your replies, im using 95 octanes since the first day, but im gonna try with 91 and set the trip B for the next refuel.

swng · 02-16-2006, 08:19 PM

Quote:

Originally Posted by GabL

Use what is recommanded in your user manual...

http://autorepair.about.com/od/engin...hoctanegas.htm

Actually, you and why? know a lot

!

why? · 02-17-2006, 08:40 AM

No experience with it, I don't remember seeing anything like that marketed over here.

But additives usually do something interesting, so you could give it a try and see what it does, but since it is the same octane, it prolly will only do things like clean the engine, I don't think it would make a difference in the power output of the vehicle.

yariman · 02-18-2006, 06:13 PM

Additives help clean the fuel system etc. but you are only wasting money using higher octane thinking that the Yaris will benefit from it. As I mentioned in another post, unless you change your prom fuel/timing maps you can't advance your timing or add more fuel to even get detonation.

why? · 02-19-2006, 09:01 AM

ECU's from the factory can adjust. They have to adjust in case you get a bad tank of fuel, and they can adjust a little the other way as well.

AutoTech1 · 02-24-2006, 01:23 PM

There is no need to run higher octane fuel than what is stated in your manual. You'd just be wasting your money. Higher octane fuel is mostly used when some form of forced induction is introduced. This higher octane helps to prevent detonation, which can destroy a motor. Why do you think many European cars require higher octane fuels? Because they come with turbo's and superchargers from the factories...

AutoTech1 · 02-24-2006, 01:27 PM

Quote:

Originally Posted by ToTo

Hi guys! So the harder for the fuel to burn is not good in the long run? I have a TS model, I currently use 95 octane... What if I were to use 98 or 100 octane fuel, what would change? Would the car run better or would I feel a bit more power or torque, or is all this just BS?

You don't need higher octane, unless you are running some set up that requires it. You are wasting your money on protection you don't need.

why? · 02-25-2006, 10:16 AM

An Ecu will prolly not adjust for all octanes. I do believe it will adjust some for higher octane fuels, just as it adjusts if you get a bad tank of gas. How much it adjusts and wether or not it is actually worth it depend on the cost of fuel and are questions that cannot be answered without extensive testing.

As to what it would do, it would advance timing and lean out the fuel ratio so that a more precise explosion will happen every time, this would make the car more powerful and get better gas mileage.

There only way to find out if it benefits you is to try it and keep records of power and gas mileage you get with each octane level.

02-14-2006, 10:18 AM	#1
krakkhenz Drives: Toyota Yaris Join Date: Jan 2006 Location: Panama Posts: 9	What type of octane I should use??? Im a little confused about this, my car seller told me that I should use 95 octane gas, but the manual says I should use 91 What are the difference between 91 and 95??? My yaris got a 1.3 engine.

02-15-2006, 11:09 PM	#8
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	Don't worry friend, the higher is the octane no., the harder it is for the fuel to burn.

02-18-2006, 06:13 PM	#14
yariman Speed Wrenchin' Drives: 2006 Yaris 3 door, Bayou Blue Join Date: Jan 2006 Location: Delta,B.C. Canada Posts: 96	Additives help clean the fuel system etc. but you are only wasting money using higher octane thinking that the Yaris will benefit from it. As I mentioned in another post, unless you change your prom fuel/timing maps you can't advance your timing or add more fuel to even get detonation. __________________ Quench my thirst with gasoline

02-14-2006, 11:22 AM	#2
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	I'd go with what the manual says. The difference between octanes is how much pressure is required to ignite the fuel. The higher the rating the harder it is to ignite the fuel.

02-15-2006, 09:11 AM	#3
GabL I want JDM bumpers! View User's Garage Drives: 5 Dr Yaris RS in Blazing Blue Join Date: Feb 2006 Location: Toronto Posts: 419	I thought the car (Yaris) can run on 87?

02-15-2006, 04:55 PM	#5
GabL I want JDM bumpers! View User's Garage Drives: 5 Dr Yaris RS in Blazing Blue Join Date: Feb 2006 Location: Toronto Posts: 419	oh, didn't saw the OP was from Panama...

02-15-2006, 08:15 PM	#6
as400g33k Drives: 05 YRS Silver Lining Metallic Join Date: Jan 2006 Location: Australia Posts: 249	the yaris is rated to run at 91 but can also accept higher octane. most people would claim a performance boost when using higher octane. while some would even claim better fuel efficiency with higher octane. we use 91, as it is cheaper than 95, 98 or 100 octane. :)

02-16-2006, 08:19 AM	#9
GabL I want JDM bumpers! View User's Garage Drives: 5 Dr Yaris RS in Blazing Blue Join Date: Feb 2006 Location: Toronto Posts: 419	Use what is recommanded in your user manual... http://autorepair.about.com/od/engin...hoctanegas.htm

02-16-2006, 11:27 AM	#11
krakkhenz Drives: Toyota Yaris Join Date: Jan 2006 Location: Panama Posts: 9	ummm... thanx for your replies, im using 95 octanes since the first day, but im gonna try with 91 and set the trip B for the next refuel.

02-17-2006, 08:40 AM	#13
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	No experience with it, I don't remember seeing anything like that marketed over here. But additives usually do something interesting, so you could give it a try and see what it does, but since it is the same octane, it prolly will only do things like clean the engine, I don't think it would make a difference in the power output of the vehicle.

02-19-2006, 09:01 AM	#15
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	ECU's from the factory can adjust. They have to adjust in case you get a bad tank of fuel, and they can adjust a little the other way as well.

02-24-2006, 01:23 PM	#16
AutoTech1 Drives: None yet Join Date: Feb 2006 Location: Farmington NY Posts: 63	There is no need to run higher octane fuel than what is stated in your manual. You'd just be wasting your money. Higher octane fuel is mostly used when some form of forced induction is introduced. This higher octane helps to prevent detonation, which can destroy a motor. Why do you think many European cars require higher octane fuels? Because they come with turbo's and superchargers from the factories...

02-25-2006, 10:16 AM	#18
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	An Ecu will prolly not adjust for all octanes. I do believe it will adjust some for higher octane fuels, just as it adjusts if you get a bad tank of gas. How much it adjusts and wether or not it is actually worth it depend on the cost of fuel and are questions that cannot be answered without extensive testing. As to what it would do, it would advance timing and lean out the fuel ratio so that a more precise explosion will happen every time, this would make the car more powerful and get better gas mileage. There only way to find out if it benefits you is to try it and keep records of power and gas mileage you get with each octane level.