I think you answered your own question. If you ping when you use 87 like most of us that have a SC do, then the supercharger will compound the issue by adding more air to an already lean mixture. I think we will have to agree to disagree, while it may be feasable I dont think I will be running 87, i will stick to what nissan recommends. While i am no mechanic to come up with a mechanical reason behind why when I went to 87 it pinged, all I know is that when I went to premium, it stopped pinging. It could be that your timing is retarded so much the engine can use 87, but you arnt getting full performance out of the engine. Who knows, but if it works for you go for it. My only concern is that there is a reason why premium is "recommened", Id hate to see some people with SC start using 87 and have issues.