If you use premium all the time you may find better performance (if you drive hard most/all the time)
The engine does have some self adjustment to driving that will give a tiny increase in performance over 87 octane if you use 93 ALL the time. and drive like a bat out of h*ll 90% of the time.
if you drive like a Granny, forget it.
I got a glimpse of a new Nissan Z tonight as I passed it doing 85mph in a 50 zone on the freeway. They were doing somewhere near 50'ish... Too bad, such a cool car to do just the speed limit in