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What is the best fuel grade to put in a 1990 gtst sedan?

I have been told a few different answers, so I am really lost...
 

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As long as the stock map hasn't been messed with and the car's fairly stock 91 or 93 octane premium will do okay - definitely don't run regular because it's much lower octane than the Japanese gas these cars were meant to run on. My GT-R was modded though and so now that I'm doing a build and running a new standalone ECU I'll have it properly tuned for the weak-ass 91 we have here on the West Coast.
 
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