procivic
Elite Sponsor
- Joined
- Jan 29, 2016
- Threads
- 123
- Messages
- 1,524
- Reaction score
- 1,136
- Location
- Ventura, California
- Website
- www.procivic.com
- Vehicle(s)
- 2017 Civic Si Sedan, Others
I initially though that too, but it just seems not to be the case. When you put 91 octane in a non-Sport model, it gets the same gains. The ECU is very smart and dynamically adjusts (over time) to the higher octane fuel.I thought the difference was because of the Sports downpipe and exhaust which is different from the other models, possibly larger diameter and/or free flowing exhaust.
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