I was running low on gas and did something I never do. I stopped at a station I haven't used yet with my car. I put $20 in (about 5 gallons) of premium 93 octane. Or what the pump said was 93! Yesterday I noticed my car was “dragging” on the way to work. On the way home the problem seemed even worse. I couldn’t really tell how bad it was till I got off the freeway and Ghostly seemed to be idling pretty rough. So I did what I normally do to clean here out and revved it up for a moment. Normally my car “burps” because of the exhaust….but let me just say, not only were there burps, there were also backfires. All the way home she did this. All the way home any chance I could, I had to blip the gas to keep her clean…and everytime it was obnoxious. Actually she really sounded kind of cool…. But I knew she had an upset tummy… So luckily I had less then a ½ tank, so I went to my normal station and topped it off with their premium. The issue seems to have been fixed. Just a quick reminder of how sensitive your GXP can be, especially if it’s tuned!