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I noticed the 2020 GTS is calling for 93 Octane petrol.

Do you know if this is a change? Is it relevant to all 2020 Macans?

I have searched minimally but have yet to find a franchise that readily offers 93 Octane in SO Cal.

Per NYT:
if the car requires premium, that’s what you should buy to keep the engine in peak tune. The octane rating posted on the pump is a measure of the fuel’s resistance to detonation — combustion gone rogue inside the cylinders. In cars from 1980 and earlier, the condition could be heard as pinging or knocking — the sound of stones rattling in a tin can.

Recently, the quest by automakers for increased efficiency and power has resulted in engines with higher internal operating pressures, accomplished by raising the compression ratio, adding a turbocharger, supercharger, or both.

Under those conditions, the formulation of premium gasoline with an octane rating of 91 or more is needed to assure that combustion in the cylinders is kept under control. The higher the octane, the greater its ability to prevent the unruly type of combustion engineers call detonation. The goal is to ignite the fuel mixture solely with the spark plug, rather than from the heat in the cylinder, to prevent detonation, which can seriously damage high-performance engines.
 

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Have a 2020 S and it calls for 93 but max you can find in LA is 91 - It's fine.
 

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The ECU will dial back ignition advance to prevent detonation but you’ll also not be getting the rated power/ economy you’d get with the 93 octane the engine was designed to run on.
 

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When I picked-up my 2020 S the Porsche delivery specialist said to use 91 octane as there will be absolutely no difference in performance between 91 and 93. (?)

I use 93 as it's readily available here in Toronto.
 

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Interesting. Around where I am (quite a bit to the left of Toronto) Co-op and Shell are the only stations I have found without ethanol (filler) in their premium gasoline. Both are at 91 Octane.

Question : is 93 Octane with ethanol better/worse than 91 Octane without?

I tend to prefer ethanol-less, but mainly because my old cars don’t like it.
 
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That’s a very good question, also in the GTA. I was running 94 from Petro.....but now 93 Esso, both so the Corn.

I also run a Cobb tune , 91.
 

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Interesting. Around where I am (quite a bit to the left of Toronto) Co-op and Shell are the only stations I have found without ethanol (filler) in their premium gasoline. Both are at 91 Octane.

Question : is 93 Octane with ethanol better/worse than 91 Octane without?

I tend to prefer ethanol-less, but mainly because my old cars don’t like it.
Ethanol helps provide a higher octane rating but at the expense of fuel economy (since there's less total energy per liter in ethanol fuels) and with some risk of gumming things up (ethanol fuels go bad faster and leave more deposits).

If your vehicle can take advantage of higher octane (e.g. by dialing in more timing due to the increased detonation resistance in higher octane fuels) then use the 93/94. If your vehicle can't, then using non-ethanol fuel will be better for the vehicle long term and give you slightly better mileage (we're talking 1mpg or so at best).
 

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Good advice. Thanks @SomeGuy ;
 
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