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

[peter at thescirocco.com (Peter)]

I found the opposite when I had a company gas card.

My 16V ran better, and got better mileage on high octane.

BP's 92 octane wasn't enough for my 16V, with the timing set to stock.

The 16V's need high octane fuel to run at it's optimum, and it made a 
noticible difference to me.

The knock box retards the timing, where as advancing it would makle it ping 
even more.

Peter

----- Original Message ----- 
From: "Michael Abatzis" <mabatzis@gmail.com>
Cc: <scirocco-l@scirocco.org>
Sent: Wednesday, March 14, 2007 8:24 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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