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Old 07-18-2019, 06:47 PM   #1
Scooby Newbie
Member#: 479655
Join Date: Dec 2017
Location: Omaha Ne
2002 Impreza wrx

Default Octane and tune?

Currently Iím tuned with 91 octane. The 91oct that Iíve been tuned with specifically says at the gas pump (no ethanol). Iíve read somewhere that you can use 93 for ďextra protectionĒ just in case for knock or detonation. I guess my question is....

Can I use 91oct with ethanol?
Can I use 93oct if I choose so?

Any feed back would be much appreciated. I havenít asked my tuner, mainly because i donít want to bother him lol
Thank you
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Old 07-18-2019, 07:00 PM   #2
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
2004 WRX wagon


yes, it wil be fine, also you could proabaly talk to your tuner to get that info as well
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Old 07-19-2019, 05:44 PM   #3
Scooby Newbie
Member#: 501522
Join Date: May 2019
Location: Front Range, Colorado
2019 WRX STI
Pearl White


Pretty sure your tuner would prefer you bother him and get the right answer than asking random people on the internet for advice.
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Old 07-19-2019, 11:56 PM   #4
Scooby Specialist
Member#: 78640
Join Date: Jan 2005
Chapter/Region: NESIC
19 Tundra
04 STi


Yes and yes.
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