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

[jlagnese at massed.net (John S. Lagnese)]

Definitely, its the knock and the recommended octane situation that's 
peculiar.
----- Original Message ----- 
From: "Michael Abatzis" <mabatzis@gmail.com>
Cc: <scirocco-l@scirocco.org>
Sent: Wednesday, March 14, 2007 9:24 AM
Subject: Re: 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.
>
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