I am one
my car is a 2009 model. I got 391 whp. I was expecting to break the 400 whp mark. After reading through this forum and how the oem software update are improving whp numbers, I performed a full software upgrade a month ago and did a tune again. I have yet to dyno another time. I am using 95 octane. Though many say it is more like 91. But that is the best we got here.
I would have posted the dyno video and graph, but stupid iPhone showed an update to ios6 without giving me heads up that I needed to back up my phone 1st. So i lost everything including my entire summer memories!