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Did I read right??:dunno::dunno: Somewhere I read that using 89 octane leaves no soot on tailpipes. Is this true? :dunno::dunno:Has anybody done it? I'm about to play guinea pig and find out...Just waiting for a long trip so the 89 tank doesn't last too long...
 

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If the car is stock, then yes, it still leaves the tailpipes black, based on how the car runs rich/lean.
 

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Why go down to 89 and suffer on performance? Ill take cleaning black tips a few times a week over -hp anyday.
 
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