I'm at about 5600 ft and have been running my edge on level 2 with 85 octane without any problems. I also have run level 3 with just 87 octane without any problems as well. Both levels run great without any knocking. Just wondered if there is anyone else out there at altitude that are doing the same thing as I and what (if any) custom settings they are running. I am just running the canned tunes at this time and am very pleased with just those. My mileage has stayed the same but the performance is way up.