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Your car (whatever it is - you didn't tell us) should run no differently whether it has 91 or 93 octane in the tank. That is simply not a big enough difference to make a difference. That, and you did not tell us what is meant by "run right". What changes? Or what is it that you think changes?
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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