Just filled up the tank with 91 octane premium fuel - Toyota Yaris Forums

07WYarisRS · 05-10-2009, 05:58 PM

http://www.youtube.com/watch?v=2jbcC...eature=related

here is the perfect example, higher octane when not needed actually reduces HP
I'll never argue the FACTS when talking about increased compression and forced indiction, i have built many engine N/A and boosted.
Sure these cars can and WILL see power gains when using higher octane levels that will allow an engine to run at higher boost levels without knock. BUT these cars were designed to run higher octane fuels, but made to accept low octane as well.

but we are talking about a stock Yaris here and economy car designed to run on economy fuels for the best bang per buck per mikle and the quesion is if the higher octane gives any mileage or performance gains over 87
87 will give you the best MPG in this econo box

05-10-2009, 05:58 PM	#10
07WYarisRS HardlyDangerous Drives: 09 Yaris LE, H/B, auto Join Date: Jul 2006 Location: Ridgeway Ontario Posts: 573	http://www.youtube.com/watch?v=2jbcC...eature=related here is the perfect example, higher octane when not needed actually reduces HP I'll never argue the FACTS when talking about increased compression and forced indiction, i have built many engine N/A and boosted. Sure these cars can and WILL see power gains when using higher octane levels that will allow an engine to run at higher boost levels without knock. BUT these cars were designed to run higher octane fuels, but made to accept low octane as well. but we are talking about a stock Yaris here and economy car designed to run on economy fuels for the best bang per buck per mikle and the quesion is if the higher octane gives any mileage or performance gains over 87 87 will give you the best MPG in this econo box __________________ The early bird gets the worm, but the second mouse gets the cheese. Last edited by 07WYarisRS; 05-10-2009 at 06:09 PM.

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