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Discussion Starter #1
Southern California does not have 93 Octane at the pump, so do you loose any type of performance running 91 Octane consistently in an RS?


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Yes, I'd fully expect less hp on 91 vs 93. I wouldnt worry about it too much, if 91 is all you can get I wouldnt lose any sleep over it. From what i have read in passing, its about 15-20wtq difference between the two. You are going to be on the same level as any other car in CA. You could always get a tune and add performance parts if it worries you. Going to an E30 blend or similar would make some nice power with the usualy bolt ons and tune


edit, here is mountune's site, they have a dyno graph if you scroll down showing the 91 octane over their tune:
https://www.mountuneusa.com/COBB-Accessport-V3-ECU-Flasher-Ford-Focus-RS-B3-p/ap3-for-004b3.htm

and an R&T article giving numbers on 91 gas too:
https://www.roadandtrack.com/new-cars/videos/a31143/heres-what-the-ford-focus-rs-actually-puts-down-on-the-dyno/
 

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Discussion Starter #6
Do you think if there’s a pre-owned RS for sale at a dealership, that they put 87 in it? It’s crossed my mind before, especially if it’s not a Ford Dealer.


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I mean they could have filled it vanilla pudding or with whatever but Ford says it takes premium, so I'd expect them to stick to it. You can ask but no way know what fuel the previous owner used prior to being sold back to a dealer.

If the car runs well, i wouldnt sweat it just stick to premium going forward.
 
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