Higher octane fuel - Toyota Yaris Forums

jkuchta · 02-25-2009, 11:31 PM

The octane specified in the owner's manual is a MINIMUM requirement, not a recommended octane rating. Your warrenty will NOT be voided by running higher test fuel.

I see higher ignition advance under all conditions (via scangauge) with 91 than I do with regular, which tells me that the car is actually taking advantage of the higher octane. The people that mention their warranties being voided on this forum would do well to learn about octane ratings and meanings.

Tamago · 02-26-2009, 12:01 AM

Quote:

Originally Posted by jkuchta

The octane specified in the owner's manual is a MINIMUM requirement, not a recommended octane rating. Your warrenty will NOT be voided by running higher test fuel.

I see higher ignition advance under all conditions (via scangauge) with 91 than I do with regular, which tells me that the car is actually taking advantage of the higher octane. The people that mention their warranties being voided on this forum would do well to learn about octane ratings and meanings.

and does your scangauge pat you on the back and say 'omg bro, check out your newly found power!!' ?

Castaway · 02-26-2009, 08:39 AM

Wikipedia: The octane rating is a measure of the resistance of gasoline and other fuels to detonation (engine knocking) in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to detonation, so they require higher octane fuel. A lower-performance engine will not generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.

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02-25-2009, 11:31 PM	#1
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	The octane specified in the owner's manual is a MINIMUM requirement, not a recommended octane rating. Your warrenty will NOT be voided by running higher test fuel. I see higher ignition advance under all conditions (via scangauge) with 91 than I do with regular, which tells me that the car is actually taking advantage of the higher octane. The people that mention their warranties being voided on this forum would do well to learn about octane ratings and meanings.

02-26-2009, 08:39 AM	#3
Castaway View User's Garage Drives: 2008 Yaris hb 2d Join Date: Dec 2008 Location: Quebec city Posts: 40	Wikipedia: The octane rating is a measure of the resistance of gasoline and other fuels to detonation (engine knocking) in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to detonation, so they require higher octane fuel. A lower-performance engine will not generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.