Higher octane fuel - Toyota Yaris Forums

frailer · 02-22-2009, 09:59 PM

Hi, I have just taken delivery of a 5 door hatch, location Eastern Australia. My main problem is that I may need to be prised out of the driver's seat sometime. I love the damn thing!
The VVTi obviously smooths out a lot of things, but feel that stating 91 RON as the fuel to use doesn't make sense to me. Marketing silliness, IMO.

Given that the compression ratio is 10.5:1; I reckon on my 1st fill, (sometime in 2010...LOL

), I may switch to 95 RON. I think that I may get increased mpg, more zip/smoother...though few complaints there; and also be kinder to the motor.

It's a 1.3 litre donk.

Would welcome anyone's experiences.

...Oops! Just found some threads...Mods feel free to flick my thread. Thanks...

Tamago · 02-22-2009, 10:01 PM

nope, won't see improvements

if toyota had bothered to make the ECU a little more agressive you would..

but ..

you won't..

don't waste your money ;)

frailer · 02-22-2009, 10:11 PM

Thanks guys. I understand that RON number calculations differ around the world. Here in Aust. we have 91, 95, 98. After reading here:

http://www.yarisworld.com/forums/showthread.php?t=3233

...and your comments; I'm going to stick to 91, I think. I guess Toyata have been smart enough to design it around the lower octane fuel, despite the slightly higher comp. ratio.

Appreciate your input.

BluYrs · 02-23-2009, 01:35 AM

95 is recommended for my 1,0, however I use 98. Why? The engine runs a lot smoother (less vibration), MPG and power gains are negligible (if any), but it just feels a lot better. The nonexistent price difference around here (1,5%) makes this a no-brainer for me.

Yar Is Word · 02-23-2009, 02:02 AM

I used premium in an ECHO for 5 years and always from name brands, not the cheap gas. The car simply ran smoother, it had more power, and got better mpg (about 2 per gallon). The increase in mpg did not cover the increase in cost but the peace of mind was worth it.
In the Yaris the first two tanks were regular. I felt the acceleration could improve. Since premium was put in a difference has been noticed. The car is relatively new so I don't have any long term mpg improvement data.
I have read a couple studies and many opinions such as the ones above stating that it's a waste but that has not been my experience.
A simple test would be to run premium for a few tanks and see if you notice any improvements.

06vitzRS · 02-23-2009, 02:09 AM

From what i learned in my technical training, going with a higher octane will do nothing but drain your wallet faster. Just put in what the owners manual states. To each there own, if you want to put in a higher octane it's your choice.

YarisSedan · 02-23-2009, 02:10 AM

Higher octane will lead to excessive carbon buildup

jambo101 · 02-23-2009, 05:25 AM

Quote:

Originally Posted by Yar Is Word

I used premium in an ECHO for 5 years and always from name brands, not the cheap gas. The car simply ran smoother, it had more power, and got better mpg (about 2 per gallon). The increase in mpg did not cover the increase in cost but the peace of mind was worth it.
In the Yaris the first two tanks were regular. I felt the acceleration could improve. Since premium was put in a difference has been noticed. The car is relatively new so I don't have any long term mpg improvement data.
I have read a couple studies and many opinions such as the ones above stating that it's a waste but that has not been my experience.
A simple test would be to run premium for a few tanks and see if you notice any improvements.

This attitude is what the oil companies are after,Someone who is totally misinformed and think the higher octane gasoline somehow gives more power,better gas mileage and somehow works better than what the engineers who designed the engine recommend

I think this attitude has been perpetrated by all the fancy names they call the higher octane gasolines relegating the lower octane gas as an inferior alternative to Premium,Gold Ultra,Super etc.When in actuality the only difference between 87 octane and 93 octane is detonation parameters not the quality of the gas.The owners manual in all Yaris and Echo's call for the lower octane rating of the usual three choices of gasoline.If there was any merit to the higher octane = more power and better mpg dont you think the car companies/engineers would be the first to recommend the higher octane gasoline.
The logic of buying an inexpensive automobile who's forte is fuel economy then putting a more expensive higher than recommended octane gas in it escapes me.

MUSKOKA800 · 02-23-2009, 07:39 AM

Save your money and follow whatever your owners manual specifies. That's what it's designed to use most efficiently.

Tamago · 02-23-2009, 09:05 AM

lol @ the answer repeated over and over again, even after the OP has acknowledged..

BLAZINBLUEVITZ · 02-23-2009, 09:42 AM

BOOO, i guess i waste my money.........

YarisPR · 02-23-2009, 11:24 AM

I use 91 always!!! (unless unavailable)
Why?
Here (in P.R.) Regular gas (specially from generic gas stations) = POS!!!
Premium (91) gas = maybe regular gas up there in the states. My prove? VW 1973 Tranporter (91+ only). Cheap 91 in this VW = bad combustion, rattling, slow response, it even stays a few seconds rattling after its turned off. So if the cheap/generic 91 sucks. I don't even want to know what the 89 (regular) does. So thats why I use 91.

jkuchta · 02-23-2009, 12:18 PM

The octane mention in the owner's manual is a MINIMUM requirement, not a recommended octane rating.

I see higher ignition advance under all conditions (via scangauge) with 91 than I do with regular.

YarisSedan · 02-23-2009, 02:38 PM

Maybe you guys who say 91 is better is because you have so much carbon buildup in the engine that its changed the compression ratio so thus it does run slightly better with higher octane now =) Carbon on top of the pistons reduces the volume of the combustion chamber

frailer · 02-23-2009, 10:15 PM

I don't mind the extra posts. It's all a mixture of info and opinion. Just gotta use your head to sift through it.

I'll keep an open mind, but continue with 91, (base fuel here).

Thanks for the replies.

1NZYaris1 · 02-24-2009, 12:15 AM

Quote:

Originally Posted by Tamago

nope, won't see improvements

if toyota had bothered to make the ECU a little more agressive you would..

but ..

you won't..

don't waste your money ;)

Yep Save your money and put it towards Mod's ,
like air intake , axle back exhaust , NST pullies will give you an amazing boost, and once you've done that you will need a short shifter to keep up

1stToyota · 02-24-2009, 09:16 AM

Quote:

Originally Posted by 1NZYaris1

Yep Save your money and put it towards Mod's ,
like air intake , axle back exhaust , NST pullies will give you an amazing boost, and once you've done that you will need a short shifter to keep up

Yes, and after those mods and a performance tune then that'd be the time to actually make use of the higher octane.

Tamago · 02-24-2009, 09:23 AM

Quote:

Originally Posted by 1NZYaris1

Yep Save your money and put it towards Mod's ,
like air intake , axle back exhaust , NST pullies will give you an amazing boost, and once you've done that you will need a short shifter to keep up

don't forget to buy a neck brace so you don't injure anything with your newfound rocket-like acceleration.

02-22-2009, 09:59 PM	#1
frailer Drives: '08 5 door Join Date: Feb 2009 Location: Sydney, Australia Posts: 7	Higher octane fuel Hi, I have just taken delivery of a 5 door hatch, location Eastern Australia. My main problem is that I may need to be prised out of the driver's seat sometime. I love the damn thing! The VVTi obviously smooths out a lot of things, but feel that stating 91 RON as the fuel to use doesn't make sense to me. Marketing silliness, IMO. Given that the compression ratio is 10.5:1; I reckon on my 1st fill, (sometime in 2010...LOL ), I may switch to 95 RON. I think that I may get increased mpg, more zip/smoother...though few complaints there; and also be kinder to the motor. It's a 1.3 litre donk. Would welcome anyone's experiences. ...Oops! Just found some threads...Mods feel free to flick my thread. Thanks...

02-23-2009, 01:35 AM	#4
BluYrs ヴィッツドライバー View User's Garage Drives: 2006 3d 1.0 Linea Sol Join Date: Aug 2007 Location: Tallinn, Estonia Posts: 433	95 is recommended for my 1,0, however I use 98. Why? The engine runs a lot smoother (less vibration), MPG and power gains are negligible (if any), but it just feels a lot better. The nonexistent price difference around here (1,5%) makes this a no-brainer for me. __________________ The blue one

02-23-2009, 02:09 AM	#6
06vitzRS View User's Garage Drives: 06 Yaris HB Join Date: Oct 2008 Location: Alberta,Canada Posts: 43	From what i learned in my technical training, going with a higher octane will do nothing but drain your wallet faster. Just put in what the owners manual states. To each there own, if you want to put in a higher octane it's your choice. __________________ 4th year apprentice mechanic.

02-23-2009, 02:10 AM	#7
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Higher octane will lead to excessive carbon buildup __________________ http://www.cardomain.com/ride/3210549

02-23-2009, 07:39 AM	#9
MUSKOKA800 Drives: '08 Yaris Sedan, Aero Package Join Date: Oct 2008 Location: Burlington, Ontario, Canada Posts: 1,720	Save your money and follow whatever your owners manual specifies. That's what it's designed to use most efficiently. __________________ TRD Upgrades: 18" Wheels wrapped in 215/35/18 PZero's, Sportivo Shocks/Struts, Lowering Springs, Swaybar, Axle-Back Exhaust, Oil Cap, Rad Cap, Signage. Aftermarket Goodies: Piggies SS, K&N Drop-In, Blitz S/C, DC Header, NST Pulley) Toyota Options/Accessories: Sport Pedal Covers, Sport Shift Knob, Ipod Interface, Summer Mats, Winter Mats, Cruise Control, Auto-Dim Mirror, Echo steelies with winter boots.

02-22-2009, 10:11 PM	#3
frailer Drives: '08 5 door Join Date: Feb 2009 Location: Sydney, Australia Posts: 7	Thanks guys. I understand that RON number calculations differ around the world. Here in Aust. we have 91, 95, 98. After reading here: http://www.yarisworld.com/forums/showthread.php?t=3233 ...and your comments; I'm going to stick to 91, I think. I guess Toyata have been smart enough to design it around the lower octane fuel, despite the slightly higher comp. ratio. Appreciate your input.

02-23-2009, 02:02 AM	#5
Yar Is Word Drives: Yaris 5 door liftback Join Date: Jan 2009 Location: Portland, OR Posts: 648	I used premium in an ECHO for 5 years and always from name brands, not the cheap gas. The car simply ran smoother, it had more power, and got better mpg (about 2 per gallon). The increase in mpg did not cover the increase in cost but the peace of mind was worth it. In the Yaris the first two tanks were regular. I felt the acceleration could improve. Since premium was put in a difference has been noticed. The car is relatively new so I don't have any long term mpg improvement data. I have read a couple studies and many opinions such as the ones above stating that it's a waste but that has not been my experience. A simple test would be to run premium for a few tanks and see if you notice any improvements.

02-23-2009, 09:42 AM	#11
BLAZINBLUEVITZ View User's Garage Drives: 2007 YARIS 3DOOR Join Date: Jan 2009 Location: NEW YORK Posts: 1,275	BOOO, i guess i waste my money......... __________________ EVERYBODY EVENTUALLY COMES BACK TO YARISWORLD......

02-23-2009, 11:24 AM	#12
YarisPR Drives: Yaris Sedan Join Date: Sep 2006 Location: MayaWest, Puerto Rico Posts: 1,574	I use 91 always!!! (unless unavailable) Why? Here (in P.R.) Regular gas (specially from generic gas stations) = POS!!! Premium (91) gas = maybe regular gas up there in the states. My prove? VW 1973 Tranporter (91+ only). Cheap 91 in this VW = bad combustion, rattling, slow response, it even stays a few seconds rattling after its turned off. So if the cheap/generic 91 sucks. I don't even want to know what the 89 (regular) does. So thats why I use 91. __________________ I Drive a 129whp Yaris ;)

02-23-2009, 12:18 PM	#13
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	The octane mention in the owner's manual is a MINIMUM requirement, not a recommended octane rating. I see higher ignition advance under all conditions (via scangauge) with 91 than I do with regular.

02-23-2009, 02:38 PM	#14
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Maybe you guys who say 91 is better is because you have so much carbon buildup in the engine that its changed the compression ratio so thus it does run slightly better with higher octane now =) Carbon on top of the pistons reduces the volume of the combustion chamber __________________ http://www.cardomain.com/ride/3210549

02-23-2009, 10:15 PM	#15
frailer Drives: '08 5 door Join Date: Feb 2009 Location: Sydney, Australia Posts: 7	I don't mind the extra posts. It's all a mixture of info and opinion. Just gotta use your head to sift through it. I'll keep an open mind, but continue with 91, (base fuel here). Thanks for the replies.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Fuel Economy	swng	Fuel Economy Forum	2089	01-23-2015 06:41 PM
The Advantages of Nitrous on an Engine	KCALB SIRAY	Performance Modifications	7	01-02-2009 10:53 AM
Facts of Higher Fuel Octane	Yaris TTE JWRC	General Yaris / Vitz Discussion	9	01-29-2007 07:16 PM
higher octane fuel	KSIbucky	DIY / Maintenance / Service	37	01-14-2007 07:17 PM
What octane fuel is recommended?	sroberts	General Yaris / Vitz Discussion	4	06-09-2006 08:54 PM