Well, I can see after reading through these links, that 87 is pretty much what we should be putting in these sixth gens.....as I cannot really explain it technically, and it seems unbelievable to read with human eyes, the truth has it that using premium fuel actually harms the performance of these vehicles; I guess I am sticking with regular unleaded and adding premium once in a blue moon to maybe "clean up" the fuel loop every now and then....