I know the manual says you gotta use 93 octane, but I haven't found it at a single station. I've been using 91 because that's all I find... Is this going to cause problems down the road? Have 600 mi on my 05 STi at this point. Can't wait to finish breaking it in.

 

91 octane is fine. You can also get 100 at the pump at the 76 at Watt and Howe (I think).