Originally Posted by irpq11
But there is defifitely a difference in the 0-60.
And I don't think that 300 rpm shift would be the difference in a full second.
No not all by itself, but it shows that there's probably more going on than just higher octane gas. GM has definately done some tweaking to his car's tuning.
His car now shifts were it should (5800 rpms). Before it was shifting too early.