Pontiac GTO 2004-2006 - High Purge Flow???

I just made a run into town and the Check engine light/emission light came on. Uh-oh i just got this 05 m6. so i ran over to Advanced Auto and they ran a diagnostic check. THe error message came up that said "Emission system High Purge Flow". is it because my dumbass put 87 instead of 92 octane in it? or is it something that should really be worrying me?

Check the canister behind the passenger side rear bumper (just below the filler neck) to make sure the lines are all hooked up to it, and I know on the 04 there is a valve on the drivers side of the intake with a vacuum line running to the back of the throttlebody (not sure if 05-06 is the same)