Brand of Gasoline

[Grant Lenahan]

I will write it yet again.

It not as simple as the statement below.  High compression ration and advanced timing is only an issue when at WOT. if you are not at WOT there is less air and fuel, and therefore it is compressed less and has less heat rise.  PV=NRT, and P will be lower, so T will be lower.  With T lower, there will be no pre-ignition and no need to back off timing.

So it ONLY benefits mileage if you are at WOT, whcih is a tiny % of time

Grant

On Sep 18, 2012, at 8:28 PM, John Lagnese wrote:

> If your engine has a knock sensor that may just be a function of the
> advanced timing. The knock sensor retards the timing when pre-ignition is
> detected. That's why higher octane results in more power and better mileage.
> 
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
> Behalf Of Fay Kelley
> Sent: Monday, September 17, 2012 11:54 PM
> To: quattro at audifans.com
> Subject: Brand of Gasoline
> 
> I have been using Chevron gas almost exclusively for years.
> The station's card reader didn't work in Cottonwood, so I went down the
> street
> to the Union 76, the gas was about 50 cents a gallon more but
> lasted way longer.
> 
> Normally when I drive from Sedona to Phx I must get
> gasoline somewhere before returning home.
> 
> This time I drove from Sedona to PHX and back on
> ONE HALF TANK OF GASOLINE.   I went on Thurs.
> and didn't buy gas again til Sunday nite.
> 
> How can this be?
> 
> Fay
> -- 
> 
> 
> 
> 
> 
> 
> 
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