I'd like to know why we have 87 89 and 92/93/94 here ... I want 91!

Then again, they say even going from 93 to 94 makes a difference in acceleration.

And just for kicks, check these out: http://www.dynotab.com/octanebooster.htm

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr