The scary thing is people have been buying higher octane then they need for years.Your engine's compression is what determines what % octane you need in your fuel. That's all there is too it.
The fuel itself won't create more compression or better performance. And higher octane has nothing to do with cleanliness. Just compression.
Whatever the sticker says is the minimum octane, is what you're good with. You only need more octane if you modify your engine to make more compression.
"Premium", "ultra", "super", etc, is misleading.
Another myth I've heard 1000 times on the forums is that these trucks can sense higher octane and advance timing, make more power, etc.