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The other advantage to using the higher octane is it burns cleaner, I notice that the pipes on my 2LT are black with “soot” I look at my brothers Challenger who has been using 93 or Sunoco 94 are clean. Shell claims that their nitrogen enriched fuels helps clean maybe it’s true. Back to the “soot” if the pipes are like that makes you wonder what kind of build is happening in the engine.
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