2009 A4 TSI

Mark Rosenkrantz speedracer.mark at gmail.com
Thu Jun 5 10:18:59 PDT 2014

You can use Vag-com (vcds) to watch real-time timing.. And graph it.  But
generally, low load, low rpm driving will not benefit from high octane.
High quality octane comes into play with load, allowing advanced timing,
more power, and more efficiency.  So a small engine will benefit more in
everyday driving than say a 6.2L small block.

Mark Rosenkrantz
Typos sent from my droid
On Jun 5, 2014 9:50 AM, "Nick Lawrence" <nick at beol.net> wrote:

> I also have trouble with this,   I would like to see a "real time" timing
> display.    Does using regular instead of premium automatically retard
> timing?  Or does the computer  have to sense knock then change timing?
>  I personally haven't seen increased mpg using premium on my cars. But I'm
> generally not on boost a lot.
> Myth busters?
> Nick
> On 6/5/2014 8:37 AM, Paul Caouette wrote:
>> 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
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