Originally posted by Kerensky97:
No, I don't have a problem running mid-grade gas.
If you don't get rid of the knock by changing the gas then have the timing adjusted.
With an SC he should only be using premium anyway so changing gas is not an option.
I don't have this problem but I'd say since its an SC, you should still have a nice fat warranty.... take it back to the dealer and let them check it out.