2009 A4 TSI

[Paul Caouette]

OK! 

I can't help myself. Please look up the energy per unit volume of "premium" vs "regular" gas. 

I don't believe it is the fuel.  It is the way it is packed into the space where it is burned that increases the energy available. So, higher compression allows more fuel and oxygen to get pushed into the same volume awaiting that spark that lights it up. When a knock sensor detects a pre-ignituon. (Due to lower grade fuel) it regards the timing of the ignition. This will lead to less energy available in the flame front. But I don't think there is any more energy in premium gasoline. It is simply a better quality of the same stuff. 



Paul Caouette
Sent from my iPhone

> On Jun 5, 2014, at 8:13 AM, Vincent Gelinas <vrgelinas at gmail.com> wrote:
> 
> Even my little Chevy Sonic that I had (non-turbo) got 3-4 MPG better with
> more power on premium!
> 
> Vincent
> 
> 
>> On Thu, Jun 5, 2014 at 12:45 AM, John Lagnese <jlagnese at massed.net> wrote:
>> 
>> Agreed, my 16V Scirocco gets more power and better mileage with premium
>> gas.
>> 
>> David Giannandrea <david.giannandrea at sbcglobal.net> wrote:
>> 
>>> The knock sensors are used to adjust the spark timing,
>>> maybe other stuff too. This allows you to use crappy
>>> gas...BUT DON'T. It isn't cost effective, check your
>>> mileage to verify, use the best premium.
>>> 
>>> No visible engine codes. The 'knock' is sensed before
>>> you will ever hear it as part of normal engine
>>> management.
>>> 
>>> So envious.
>>> 
>>> David G.
>>> 
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