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there is no need for running anything above the 87, which is what's required for the tC, i think. i mean, you can get a 91 or 93 or premium or whatever it's called, but it's just wasting money and really, there's a debate whether it can actually do more harm to your engine, since like Zero said, it has a higher resistance to burn. once you start modding and adjusting your spark timing and whatever you might switch over to premium
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