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Might be important to note that premium ignites slower/burns slower. That is why it gets rid of knock and ping and that is why you can advance timing, run boost safer etc. Though I am not a chemist specializing in fuel, I have done some product testing for Yamaha snowmobiles. Engineers for the 4 cylinder 4 stroke 1000cc 150 HP engine say to run 87 because premium will cause more carbon build up and not be any faster. And this I have verified at radar runs.
As far as the fit goes, I think it boils down to how aggressive the fuel/timing maps are, and how they correct to a knock sensor.
I suspect that you wont get less carbon build up with premium.
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SSR Type-C, RS*R Ti 2000, Odyssey Battery, Unorthodox Racing lightweight pulley set. Tork's $11 Grill mod, 1st JDM T-Light swap, Skunk 2 short shifter, rear wiper delete, front little wiper delete, PRM intake (the original longer tube design) I am forever humbled and grateful for my wife and I having the privilege of adopting our 2 daughters from China.
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