Originally Posted by BillBoost37
Tom...in some states 91 and 92 are the highest octanes available.
Understood, but if I remember correctly that is how it is phrased in the owners manual. From that you can infer that while 91-92 is much better than 87, by running less than 93 octane, you should be more careful. If 91-92 is all that is available to you, just be aware that your chances of pre-detonation are higher than if you are running 93 and you should drive accordingly, especially since the 2000+ bonnevilles are already prone to have KR.