Originally Posted by cwg
I find it hard to beleive that the DME no longer adjusts for lower grade gas with the cobb in place. The knock sensor and pulling of timing is a basic function of how the DME works. Agreed you should run the recomended 93 with the cobb but I don't beleive that cobb would have removed this basic function from the DME when they did their tune.
That was my guess as well. I want to avoid having to reflash the car to the sport map and then back to aggressive. I figured if the combustion was adjusted I could put in a couple of gallons of 91 until I get to a 93 octane pump and not have to really worry much.