Re: [ST] Fuel octane

[Colt4530 <colt4530@xxxxxxxxxxx>]

Strizver, Chris L wrote:
"Until someone convinces me that the compression ratio of our ST's requires
the use of 92 octane fuel, I'll continue with the  89 octane and pocket the
difference."

If you can't hear it ping, with the stock exhaust, there's no reason at 
all to change your habits.

I have a Honda car that pulls harder with mid-octane.  I've never tried 
high-octane.  It has a knock sensor, so it's pulling timing out to kill 
the ping when we put low-octane in it.

My '02 RS manual calls for 95 research octane, min.  That's the highest 
rating method.  Depending on the particular fuel, the "pump" octane 
rating could be nearly anything.  Inaudible ping will almost never cause 
harm, so run whatever works best.

Some Mustangs had drivability problems on 92/93 pump octane.  Ford 
always recommended the lower grades.  It seems the High-octane stuff 
doesn't vaporize as well and the lower grades.

John


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