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Premium only. When first got it, the engine pinged under load while using regular. Premium only for me and its only 4 dollars more per tank than the cheap stuff, so why not if it helps the motor.
When I have run anything less than 93, I get a noticable knock. 93 is all I run and I try to buy from BP/Amoco when I can - it seems to get better mileage with that stuff for some reason.
Maybe it's just me but I run 87 in my trucks and my Maxima and it seems that it's just not lasting as long. Not a major hit but a few miles to the gallon on each tank less than I'm used to. I'm guessing it's the E10 mixture everyone is going to. Anyone else notice that?
The owner's manual for an 85 says Unleaded fuel. Does not give a specific octane rating. So regular unleaded will work. I run mid grade in mine.
Hope this helps.