Originally Posted by srt6_crossfire
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So question is, does running on higher octane on a regular basis cause your engine to run rich thus the carbon build-up?
If your car(or any car) isn't tuned to run 100, 105, 110, 116 octane you're just throwing away money. Whatever the car is tuned for fromt the factory is what will net you the best performance all around.............unless you tweak the ECU to run on higher octane fuel.