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That's kind of a weird question? What does it do?
 

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There is no need to run anything above 87 unless you have a chip, or higher compression.
 

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your car doesn't like 93 octane because it wasn't designed to run on it man...just cause it cost more doesn't mean its gonna be better for your car...
 

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stick to the owners manula man. there is written that all stock focuses (exept SVT) are designed to ran on a 87 octane gas, that is why ur car does not like 93 octanes
 
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