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Mid Grade gas vs High Octane gas - better performance??



higher octane won't run better or get better mileage on the 16v unless
the engine is already knocking, and the timing is being retarded.
iirc, you can connect an led to either the knock sensor directly or
the ecu to see if you're knocking.  unfortunately, cis-e doesn't
advance the timing until knock is detected; only until it reaches its
preset limit.  if it doesn't knock at this limit, than premium is a
waste.  cis cars without a knock sensor, like cathy said, don't need
premium.