I definately understand where you're coming from...but I have some news. My dad had this business partner that was the COO of Arco (definately a high roller), and at this meeting thingy, I was talking to him, and he told me that all the octane is bullshit. That it really does nothing. The only thing he said was that if your car is turbo, then definately use 91, otherwise, it makes no difference. I didn't believe him, so I kept testing for myself. I thought that every time I got premium, it drove so much cleaner and better. Then one time my dad filled up and he said it was premium. so I drove around for a while and he asked how it drove, and I told him that it was great and I could actually feel the 91 octane. Then he told me that he actually pumped 87. I'm telling you, it's all psychological. Now, when I drive with either, it doesn't matter, so I pump 87, because to tell the truth, over time, it saves quite a bit of money. Just my thoughts on the subject.