What gas grade should i use in a JDM SERIES II engine?

I have a 91 acura legend i bought, ive been putting premiumWhat gas grade should i use in a JDM SERIES II engine?
it's a 91 Acura! It's almost 20 years old! Put GAS in it! Don't waste your money on premium!
Type II engine? According to wiki it's a higher flowing intake and more aggressive camshaft. Meaning it's basically got intake upgrades (more air) over the stock engine (that was in your car). You should use premium in the bulk of engines with these characteristics to avoid knock. Considering the age you could probably get away with using regular. Choice is yours.What gas grade should i use in a JDM SERIES II engine?
Acura recommends 93 octane, what you've been putting in. Don't switch because the ECU can't compensate for lower octane for continuous use.
The C32A5 had a knock sensor, so regardless of the octane the ECU would compensate by either retarding the timing or advancing the timing. Stick with 91+ and you should be fine...What gas grade should i use in a JDM SERIES II engine?
Federal law requires all gasoline powered vehicles to run on 87 octane, pinging is a sign of other problems and a small amount under stressful conditions like heavy load up hill is ok.
premium could also add some octane boost like outlaw or the equivalent