[05impalass]

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?

 

[Guest]

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.

 

[05ss45]

i would not run 89 in an 05 ss.

 

[TheOne]

For what its worth...I have a 05 SS and I run 87 in it with no knocking or pinging.

 

[05ss45]

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