I've had several people tell me this evening (and several times previously) that their vans used the ignition key in the fuel filler and the owners manual says that.  I'm surmising that VW started using the Syncro cap toward the end of production of the Vanagon.   Every one of the mentions of that fact have owned very late production Vanagons.  Even the official VW manual on locks and keys says all 2 wheel drive use a separate key.  It seems that even the factory didn't know what they did!  I guess I should post the part numbers of the two caps and clarify it that way and not just Syncro and non.  Two totally different caps that require completely different cylinders.

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