Brand new cobalt, 500 miles on it. Sales guy told me i could run 87 octane, so i did for a tank and noticed up to 5 degree's of retard around peak torque, 3000ish rpm. Would this be do to the torque learn down thing i read about or do I have a problem? I filled it up with 94 octane now, and it still gets up to 3-4 degree's of knock retard around WOT @ 3000ish rpms then it goes away once i get up to 4500rpm-6000rpm. Any help would be appreciated.
Oh, and car is 100% stock. The mods in sig haven't been installed yet.
2010 Cobalt SS, Trifecta tune, clear image CAI, clear image DP.