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Originally Posted by chasmanz28
book says at least 87, but for better perfomance use at least 91 octane
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If Nissan states specifically in the book that you'll get more power by running more octane, then the engine was really designed for using premium fuel, since that's where the power is optimized at. To keep out of lawsuits, and to be able to advertise that the truck is supposed to take 87 octane, they may have rated the horsepower on 87 octane. If you run 87 octane, but the engine was really optimized for premium, the computer will always be retarding the timing and you'll get slightly less performance ("slightly" meaning maybe 5-10 hp at the most), although obviously no engine damage occurs because of the knock control system. After your truck breaks in, I would do some timed performance runs (or even take it to a dyno) using both regular and premium fuel and see what kind of difference you see at the rear wheels.
