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Nothing but
I dont put anything but premium 91 or 93 in my boxster.
I have never put regular in it.
However, when I am towing my cars I put premium in my truck, it eliminates the knock and the motor becomes more efficient. If I run mid grade instead of regular I get better gas mileage. I am assuming that is because of a more efficient burn.
It all depends on what the car was tuned for and what it is rated for. My friends Dodge pickup CANNOT run anything but regular because it will burn out the O2 sensors.
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