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In Texas, we have 87, 89 or 93 ... no 91. Would it be safe to run 89 in an 05 SS or do I need to stick with 93?
 
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You should run whatever the manual says. If the car was tuned for a higher octane than you are running, it will knock and ping. If you run a higher octane than what it was tuned for, it will be a waste of money.
 

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i would not run 89 in an 05 ss.
 

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like i said i wouldnt. put what the manual says,
it is tuned for high octane so put high octane.
 
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