Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 05-22-2012, 10:11 PM   #155
Focus Fanatic
Join Date: Jul 2011
Fan#: 88299
Location: Torrance, CA
What I Drive: 2012 sterling gray Titanium

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Originally Posted by eweisbard View Post
If the engine is not knocking or pinging, there is no performance to be gained by octane alone.
Consider the 2013 Mustang GT (5.0L Ti-VCT V-8 engine)
Recommended fuel: unleaded regular
HP: regular fuel: 402 @ 6,500, premium fuel: 420 @ 6,500

Two questions:

1) Do you think that the 5.0L engine is constantly "knocking or pinging" when using unleaded regular?

2) Why don't you believe that is possible for the PCM to adjust for different octane levels?

Originally Posted by eweisbard View Post
Octane is for antiknock, if its not knocking whay do you need more.
To get better performance. Isn't that simple?

Did they teach you in school that the octane requirement of an engine can change according to various tuning parameters?
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