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I see just 2008 stalling not 09. My dealer told me there was a change in the vacuum
system in the 2009 A5s. I wonder if your dealers missed a recall.
 

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I think by opening the fuel cap the vacuum created within the fuel tank is broken. After refuelling the tank needs to re-pressurise and the lack of vacuum from the tank causes the car to stall .
Cant seem to put it into words right now but i know what i mean.
I bet you wont get very far if you left the fuel cap off. Probably stall every few yards. Anyone want to experiment?
Or the carbon canister is purging at the wrong time or a bad fuel cap.
I have the Bosch GDI DVD. I says a lot about canister purging and the vacuum system. I have a 2009 A5, so far so good, no stalling.;)
 
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