I use 91, that's the highest I can get around UT/ID/CO. If there's higher I haven't seen it. However, about 50% of the premium 91 in Idaho is ethanol free which I've always preferred.

My brother always used 87 in his X5 3.0, but since he's moved on (has a 535i now) he uses 91 now. I've never understood why balk at the price difference. There's a cost for higher performance.

But I'm also used to it, the only vehicle I've owned in the past 4 years that didn't require premium is my Tundra, and that's only until the SC goes on it.

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Nathan
01 4.4i Pearl Beige Metallic