well, i've heard that running the engine with a 92 octane will make it better or burn cleaner than regular unleaded gas. once i a while i put supreme to clean the engine. what i do is i wait till the gas light comes on then i put gas.
i am not too sure if the ecu will automatically adjust to the octane rating.
i have a 4wd toyota 4runner and a tacoma, both v6, and eversince we bought them, we've been putting supreme gas and we noticed that on the muffler tip, there's no black or smoke colors, it is like still new so i guess it's better to run on supreme gas coz it will burn better. it's just my idea and it is up to anybody i guess to either run with regular or supreme. living here in hawaii where everything is so so high, it's okay to go for broke sometimes. anyways, i bought the p5 cash eventhough with the 0 % apr...