I'd make sure before I ran anything other than 87, the manual clearly states 87, except for the 5.0, which states 87 and up. I know someone who burnt there valves up running high octane.
2006 GT, FRPP drag pack, FRPP handling pack
2011 GT ordered 1/30, off the truck on 6/21
Black GT - 401a, Black/Cashmere interior
6 spd, spoiler delete, security package
3.73, HID, comfort package
Brembo brake package, Glass top
First mod - CS front fascia