Which is better 91 octane or 94 with 10% ethanol

2.5 I5 20v TFSI - 335 bhp
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RobRS3
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Which is better 91 octane or 94 with 10% ethanol

Post by RobRS3 » Mon Feb 24, 2020 1:56 pm

I'm a new owner of a RS3 and I've been tanking with Petro Canada 94 octane that has 10% ethanol. My other preferred choice is the Shell V Power with 91 octane and has no ethanol. I've been wondering if one of the two could run cleaner or better for the car and could produce a bit more power or could the difference be insignificant and are both as good?

Rob
Previous: Subaru WRX manual
Current: RS3

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Nige_RS4
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Re: Which is better 91 octane or 94 with 10% ethanol

Post by Nige_RS4 » Tue Feb 25, 2020 10:35 am

You are always better running the higher octane rating, the only thing that it normally affects is your wallet. 10% ethanol is the normal in a lot of the performance fuel these days.
CheeRS, Nige

B5 2.7t S4 - gone
B5 2.7t RS4 - gone
Ed 30 Golf DSG - gone
A5 3.0tdi - gone within 12 months!
S3 2.0 tfsi - 6+ years, but now sold
2018 Golf R 7.5

RobRS3
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Joined: Wed Jan 29, 2020 1:33 pm
Location: Ottawa, ON

Re: Which is better 91 octane or 94 with 10% ethanol

Post by RobRS3 » Tue Feb 25, 2020 2:15 pm

Good to know, so will continue with 94.

Thanks,
Rob
Previous: Subaru WRX manual
Current: RS3

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