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Those of you who say you can feel a difference between 87 and 89 are noticing a placebo effect. I've made 1/4 mile runs with 87 and with 89, there is not a dramatic difference.

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I have to disagree with this...I can feel our durango run better with better fuel, I'm sure of it.

Then one time my wife came home from driving it and asked if tuned up the durango because it was running really well. All I did was fill it with premium gas and she had no idea, so if she noticed then I have to believe it runs better with better fuel.

The premium I use has no alcohol in it BTW. Maybe that's it? The 87 we use does have alcohol in it.