I had a 93 xlt with pipes and always ran 91 oct, I don't think 87 is going to protect you from detonation problems, if it's a RMK it already has higher compression so you would be asking for trouble.
I always run 91, 92, or 93 in all of my toys. Would not want to take that chance of an issue over something so silly. Id say pay the extra 25 cents for it. Good luck!
Pretty sure that there was no such thing as a 95 xlt rmk. first year was 96 and yes they had higher compression from a thinner gasket. It probably would not detonate on 87 octane at any kind of elevation but a sea level it might.
