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my daily driver is an infiniti with Nissan's VQ motor. The book states that it runs fine on regular but for maximum performance use premium fuel. I have run it for 40k miles on mid-grade and it runs fine. I ran a few tanks of premium and didn't notice enough to justify the extra few bucks a tank.
honestly, when I bought it the dealership said don't use regular, my wife asked does it have to be premium and he was like nah, mid-grade should be fine. The lesson here is that the guy selling cars doesn't know.
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